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2009 Daily Hawkwatch Reports
Wednesday, April 15, 2009
Migration Today:
Turkey Vultures-12
Discussion:
No Swainson's Hawks on our last official day of the season. You can see why we had problems this year. Just look at that picture of me looking for a hawk!
This is the last e-mail for the season. I will send totals out in a few weeks. Migration doesn't suddenly come to a halt on April 15. We have determined that after this date the number of migrating raptors slows down tremendously. Our effort doesn't match the return in numbers of raptors. It will be very warm soon, however today it was only in the 60's. The heat can be oppressive at the hawkwatch.
The Borrego Valley Hawkwatch could not function without the volunteers dedicated to watching each season. The leaders for 2009 included:
Saturday - Paul Jorgensen Wednesday - Joe Hopkins
Sunday - Herb Stone Thursday - Bob Theriault
Monday - Hal Cohen Friday - Grace Clark and Suzanne Schmidt
Tuesday - Steve Bier
Laura Webb could be counted upon almost every day to assist and take over leadership when needed. Karin Vickers was a regular assistant on Thursdays. Paulette Ache was a wonderful help at the evening watch, along with Jackie Williams. Judy Davis spent March helping us. Several other volunteers spent hours watching with us on a daily basis. Thanks to everyone.
See you next February and keep those eyes to the sky.
Hal
Tuesday, April 14, 2009
Migration Today:
Swainson's Hawks - 1
Turkey Vultures - 42
Discussion:
Turkey Vultures began to lift-off from several locations at 8:15A. The lone Swainson's Hawk exited the valley very high. Below is a TV demonstrating a very pronounced flapping stroke. This handsome bird came very close to the morning watch.
Upstroke Downstroke Photos by Hal Cohen
Evening Watch:
Very windy conditions this evening. Twelve Turkey Vultures came into the valley. This evening is the final official watch of the season.
Prediction:
Winds will continue through the night and into Wednesday. Expectations are for a very early lift-off.
Monday, April 13, 2009
Migration Today:
Swainson's Hawks - 4
Turkey Vultures - 12
Discussion:
Two SW's were found in the potato fields and migrated northwest along Coyote Mt. Two additional Swainson's Hawks flew close to the morning watch and migrated. The TV's lifted-up from Ellis Farms and migrated west and out of the valley.
In two days, (April 15) we will officially finish the official count for the season. We will prepare final numbers for the season and send a message in a few weeks.
Evening Watch:
This evening a few Swainson's came in to roost. Two SW's are roosting in the Ellis Farms area and 1 is roosting in the date farm. 27 Turkey Vultures came in to roost in the date farm as well.
Prediction:
Hopefully the high winds expected tomorrow will hold off until the hawks and TV's migrate. Winds with gusts to 50-mph are expected tomorrow through the day and into the night. If windy early, the raptors will be up and out by 7-7:30A.
Sunday, April 12, 2009
Migration Today:
Swainson's Hawks - 18
Turkey Vultures - 11
Discussion:
A very light wind day. The SW's that roosted near Ellis Farms were actually found this morning in the potato fields east of Ellis. At 8A some were in flight east when I arrived at the potato fields. Several Swainson's kettled up and flew north toward the base of Coyote Mt where they aerial fed before streaming northwest through Coyote Canyon. The Turkey Vultures moved out during the 8-9A period
Evening Watch:
11 Turkey Vultures came in and roosted at Ellis Farms. At 7:30P 2 TV's were spotted very high. They spent 15 minutes in what appeared to be a courtship flight which included tail-chasing. No Swainson's Hawks were spotted this evening.
Prediction:
Apparently no SW's came in to roost tonight. Hopefully we will be surprised by some tomorrow. Light winds tomorrow are predicted so take-off of the TV's should be between 8 and 9A.
Saturday, April 11, 2009
Migration Today:
Swainson's Hawks - 30
Turkey Vultures - 25
Discussion:
Several Swainson's were found sitting on the ground in the potato fields early today. Only 8 SW's were counted leaving the valley from the morning site. The remainder (22) moved north from the potato fields. The TV's came in two groups from the south. The probable roosting site of the TV's was near Borrego Springs Country Club. It appears that the season, although low in numbers continues to produce some migrants.
Evening Watch:
At 7:15P we watched a group of Swainson's Hawks fly into the Ellis Farms area. It was difficult to get an accurate count as birds from the tamarisks lifted up as others landed. We estimate at least 19 birds were observed: 18 at Ellis Farms and 1 at the date farm. Twelve TV's came into the date farm as well.
Prediction:
Tomorrow winds should be light so perhaps we will see a nice lift-off. If the SW's move to the potato fields again they might migrate north. A good place to observe lift-off will be at the morning site or on Henderson Canyon Rd and a little east of Borrego Valley Rd. You might want to check in at the morning site on DiGiorgio first. If the winds remain light, lift-off will probably take place between 8:30-9:30A. We are in a warming trend. By Monday it should be in the upper 80's.
Friday, April 10, 2009
Migration Today:
Swainson's Hawks-11
Turkey Vultures-18
Discussion:
Lift-off at 8:30A from the fields east of the date farm. I spent some time at the evening site watching SW's on the ground. After lift-off, they began to aerial feed from near ground level to at least a 1,000 feet high. For over an hour most of the SW's fed before departing the valley.
Below is a photo taken by Joan Avise last year. A beautiful Swainson's close up.
Evening Watch:
This evening an estimated 20 Swainson's Hawks and 5 TV's were observed dropping into the vicinity of Ellis Farm. Additionally thousand of swallows, mostly Cliff and Barn, swirling in huge kettles were seen along with Vaux's Swifts.
Prediction:
With windy conditions predicted, look for an early morning migration. The number of swallows migrating should provide an additional spectacle. Ellis Farm is located near Henderson Canyon Rd and Borrego Valley Rd.
Swainson's Hawk, dark morph (Borrego Springs, 3-23-08) Photo by Joan Avise
Thursday, April 9, 2009
Migration Today:
Turkey Vultures-5
Discussion:
Not too much to report. The TV's lifted-off at 8:15A. The TV's expected from the Ocotillo Wells area (21) didn't appear.
Evening Watch:
A few Swainson's Hawks came in to the date farm before 7P along with 19 TV's. At least 12 Swainson's dropped into the date farm at 7:20P along with 1 TV. The totals were at least 12 SW's and 20 TV's.
Prediction:
Winds hopefully will be light early but will increase during the day. Rain is possible Friday evening into Saturday. If it is not windy early, a nice lift-off from the date farm is possible. For best views come to the evening site on Borrego Valley Rd.
Wednesday, April 8, 2009
Migration Today:
Turkey Vultures-21
Discussion:
On a very windy, cloudy day, only 21 TV's migrated past the watch. Below is a photo of the southern view from the morning site of the Table Grape Graveyard. The other picture is of a Grape Vineyard in Borrego Springs in 1950. Often folks ask about the crosses near the hawkwatch. The wood is redwood and has lasted since the late 1940's. The white structures are part of the irrigation system of the 40's.
Evening Watch:
Only 3 TV's came in to roost however about 10 south of the watch at least 20 TV's were observed.
Prediction:
Continued windy conditions tomorrow and cooler weather for Friday. Hopefully by the weekend we will see some Swainson's Hawks.
A Swainson's Hawk Festival will take place in Sacramento, California this Saturday, April 11 at 9A. It will take place at Sutters Landing. Check out the website swainsonshawk.org for more information.
Table Grape "Graveyard" today Table Grapes, Borrego Springs in the 1950's
Tuesday, April 7, 2009
Migration Today:
Swainson's Hawks-28
Turkey Vultures-5
Discussion:
Today was one of those days when 28 SW's were more fun than hundreds. The Swainson's came up shortly after 9A from the date farm. I spent an hour with new watchers at the night site across the road from the date farm. We watched as several SW's began to kettle up. They were joined by at least 8 Swainson's that roosted at Ellis Farms. Some of the SW's began to aerial feed. We could not determine what they were feeding on. There have not been swarms of flying ants lately. There are a few species of flying beetles and dragonflies in the area. Five TV's began to kettle up from Roadrunner Mobile Park. The Swainson's joined the TV's and then began to stream to the northwest. I drove into Indian Head Ranch and observed several Swainson's Hawks aerial feeding to the north. There were a dozen SW's aerial feeding as they flew through Coyote Canyon. I believe that the next staging area to the north is an easy 5-6 hour flight as these hawks were in no hurry to leave the valley.
Below is a shot of the date farm Eucalyptus trees with roosting Swainson's Hawks (can you find them all?) as well as a shot of a very close Swainson's. Both taken today.
Evening Watch:
Only 6 TV's came in to roost, no Swainson's.
Prediction:
Windy weather tomorrow so the TV's will leave early.
How many roosting Swainson's Hawks can you see? photo by Hal Cohen
Intermediate Morph Swainson's Hawk photo by Hal Cohen
Monday, April 6, 2009
Migration Today:
Swainson's Hawks-1
Turkey Vultures-38
Discussion:
A lonely vigil for the first 2 hours. I was alone when 4 small kettles of Turkey Vultures began to rise from different parts of the valley. Most of the season was crowded at the "hill". Now only a few hardy souls come out. The TV's kettled up at 9:20A from the date farm and the new roost site near Palm Canyon. Several TV's flew directly above the watch site. Kettles moved to the north and west making counting difficult.
Below is a late evening photo of Swainson's Hawks coming into the date farm to roost.
Evening Watch:
At least 6 SW's flew low into Ellis Farms at 7P. Another 18-21 SW's dropped into the date farm at 7:15P. A beautiful evening. Some of the Swainson's Hawks were aerial feeding. There are lots of flying insects available, including dragon flies. The Borrego Postmistress, a new bird-watcher, came out this evening with a brand new pair of binoculars. Her first birds were the kettle of Swainson's coming to roost. What a wonderful new binoc etching.
Prediction:
Hopefully the wind predicted for tomorrow will hold off in the morning. If light in the AM as predicted, the Swainson's will probably kettle up from both the date farm and Ellis Farms around 8:30-9:30A. Look for some aerial feeding before departure.
Swainson's Hawks coming in to roost. Photo by Hal Cohen
Sunday, April 5, 2009
Migration Today:
Swainson's Hawks - 6
Turkey Vultures - 16
Discussion:
Some of the SW's lifted-off at 8:40A. The TV's and a few SW's lifted off at 9:10 from the date farm.
Totals so far this year:
Swainson's Hawks - 1,787
Turkey Vultures - 696
Other raptors - 27
Grand Total - 2,510
The numbers this year are far below our record of almost 7,000 raptors last year.
Evening Watch:
Twenty-nine TV's came in and are roosting at the new site just off of Palm Canyon Drive.
Prediction:
Winds should be light and from the east. Perhaps we will get some migration from the southeast. The TV's will probably lift-off between 9 and 10A.
Below is an easy quiz bird:
Saturday, April 4, 2009
Migration Today:
Swainson's Hawks-8
Turkey Vultures-12
Discussion:
Swainson's moved out at a distance. Very little wind today but few raptors.
The Swainson's Hawk in the photo below illustrates the typical migratory bow ( wings taking the shape of a bow). The wings are set and the hawk is gliding with the assist of wind. This SW was moving northwest with a wind from the west. This year we have had very few hawks flying high with this shape.
Evening Watch:
A beautiful calm evening with only 5 Swainson's Hawks gliding into the Ellis Farms. This evening was the anniversary of the first big incoming migration of Swainson's Six years ago today I watched a tornado of SW's descend into the valley. Tomorrow I will share totals for the year.
Prediction:
Tomorrow we should have calm winds again. A small kettle will probably form to the east near the Ellis Farms. Our window of opportunity is beginning to shrink. Historically the number of migrants drops quickly after the 7th of April.
Swainson's Hawk in a migratory bow. photo by Hal Cohen
Friday, April 3, 2009
Migration Today:
Swainson's Hawks-3
Turkey Vultures-5
Discussion:
Only 3 SW's were observed today migrating. Very early winds may have blown the hawks from last night further east. The site from which both the SW's and TV's lifted-off from could not be determined.
Tomorrow evening marks the anniversary of the first big kettle of Swainson's in the valley. On April 4, 2003 I watched a tornado of hawks descend into the valley just before dark. After experiencing thousands of hawks in kettles in Veracruz, I am convinced I witnessed numbers exceeding 2,000 SW's that evening. Perhaps tomorrow we will have a repeat. The weather this evening was much like that fateful day, cold and windy.
Evening Watch:
An extremely windy cold evening with only 10 TV's and 1 SW to show for it. Tomorrow the wind should be light. Hopefully we will be surprised.
Prediction:
Only 1 SW and the TV's to look forward to.
Thursday, April 2, 2009
Migration Today:
Swainson's Hawks-47
Turkey Vultures-16
Osprey-1
Sharp-shinned Hawk-1
Discussion:
Swainson's Hawks were observed before lift-off both at the date farm and Roadrunner Tree Farm. Lift-off (8:40A) of most of the SW's was from Ellis Farms. Kettles of SW's were observed to the south and east of the watch. I observed migration today from a location about 2 miles from the morning site. From this site in Indian Head Ranch I watched an Osprey, Sharp-shinned Hawk and 5 TV's migrate overhead. I counted as many as 45 SW's in the haze. The first vultures were up at 9:10A. Most of the Swainson's Hawks aerial fed for an hour over horse camp northwest of the morning watch site.
Below are photos taken this morning of a diving SW (No this is not a Peregrine Falcon) and the capture of an insect.
Evening Watch:
A windy but productive evening. It seems as though the more folks we have at the watch the less birds we get. Today we had at least 21 Swainson's come in to the date farm. They spent a half hour playing in the wind. Ten TV's came in to the date farm as well.
Prediction:
The wind is picking up and could be a factor tomorrow. A very early lift-off is anticipated. The Swainson's may move northwest and feed again before departing the valley.
Stooping (diving) for the kill (either flying ants or another species of insect). Hal Cohen
Rearing back to grasp the insect. photo by Hal Cohen
Wednesday, April, 1, 2009
Migration Today:
Swainson's Hawks - 9
Turkey Vultures - 18
Discussion:
Winds in the morning got a small kettle of Swainson's up early from the date farm. At 9:45A 3 small kettles of TV's worked their way northwest. All the TV's roosted at the new site near Palm Canyon Drive. After 10A another small kettle of SW's migrated.
Below are silhouettes of two of the common birds that we observe almost daily during the hawk season. It is essential to know the difference because they are often seen together. Look at the body shape, head, and tail.
Evening Watch:
At least 57 Swainson's Hawks came into the date farm. Twenty-two Turkey Vultures landed in the Palm Canyon roost. Hopefully we will get a nice Swainson's migration this week.
Prediction:
The winds are tough to figure out lately. It could be calm early with increasing winds. Unfortunately some of the valley could be windy whereas other parts might not be windy. Come to the morning site early to find out the best viewing spot. Probably more than the 57 SW's are in the valley so it could be a fun morning.
Raven silhouette Swainson's Hawk silhouette
Tuesday, March 31, 2009
Migration Today:
Turkey Vultures-42
Zone-tailed Hawk-1
Discussion:
42 TV's lifted from the new roost site on Palm Canyon Drive at 9:28A and broke into 3 kettles. They streamed northwest very low. I watched the TV's from the tennis court at the Roadrunner RV Park. Five minutes after viewing the TV's another bird with similar markings but much smaller flew directly above me. It was a Zone-tailed Hawk. It followed the TV's as they worked their way northwest.
Evening Watch:
It was very windy and few folks were out watching. At least 8 Swainson's Hawks were counted. A few of the hawks flew above us with bulging crops. Caterpillars are still available for feeding in the valley. Ten TV's came into the newest roost site just off Palm Canyon Drive.
Prediction:
The winds should continue tomorrow. Lift-off should be early. Probably the best location to view the birds will be at the morning site on Di Giorgio Rd.
Monday, March 30, 2009
Migration Today:
Swainson's Hawks-6
Turkey Vultures-14
Sharp-shinned Hawk-1
Osprey-1
Discussion:
A hazy day with lift-off spread over a few hours 7:45-9:20A. We are concerned that most of the spring migrant Swainson's Hawks have taken a different path north this year. Hopefully the next week will be productive.
Evening Watch:
Thirty-five TV's came into the valley at 6P and are roosting 1/2 mile east of the elementary school. This is a new roosting site and has been used frequently in the past week.
Prediction:
No Swainson's were observed this evening. A lift-off of the TV's will take place a few miles southeast of the morning site. Light wind is predicted.
Sunday, March 29, 2009
Migration Today:
Swainson's Hawks-24
Turkey Vultures-20
Discussion:
A few Swainson's flew overhead. We had no expectations of additional hawks but were surprised to see a kettle of 17 SW's. At least 3 high flyers (dots) came directly overhead. The Turkey Vultures didn't disappoint, kettling up from the date farm. It is now very windy perhaps blowing some SW's into town this evening. Below is a view of 3 caterpillars decimating flowers. The SW's are still finding plenty to eat before departing.
Evening Watch:
No Swainson's Hawks came in on a very windy evening. Eight Turkey Vultures came in however.
Prediction:
Another disappointing evening. We do not anticipate a big flight tomorrow. However, we were surprised by today's numbers after only 2 SW's came in last night.
3 different stages of caterpillars-Borrego Springs, CA photo by Hal Cohen
Saturday, March 28, 2009
Migration Today:
Swainson's Hawks-28
Turkey Vultures-1
Discussion:
Distant SW's were up feeding on flying ants at 8:30A. When the hill was empty of most watchers (10A) 21 Swainson's Hawks kettled up north of the watch. We believe that these hawks were feeding on caterpillars a few miles north of the watch. It is these hawks that we saw last night. Below is an interesting shot of a nice light morph.
Evening Watch:
Lots of watchers but only 2 Swainson's Hawks and 19-24 Turkey Vultures. All of the raptors settled into the date farm.
Prediction:
Winds are predicted to be NW at 25 tomorrow so an early take-off is forecast. Hopefully we will pick up more SW's in the coming week.
Friday, March 27, 2009
Migration Yesterday:
Swainson's Hawks-5
Discussion:
Sorry, somehow the day's report misfired and didn't go out. Here it is-late-On a clear day with some wind, only 5 SW's migrated. Below is a photo taken on Thursday by Sabina Harte as several of the 187 SW's passed directly overhead and close.
In today's (Saturday March 28) San Diego Tribune there is a long article about the hawkwatch. I did not get to read it before it went to press. Yes, there are some errors like the trees the hawks favor. The trees are Tamarisks, not Manzanitas. Also, the longest citizen research project concerning birds is the Audubon Christmas Count. And 20,000 hawks can be seen in a kettle in Mexico not in a day. I just returned from today's count so I haven't looked closely at the article. Generally it is pretty good. He took a personal rather than scientific view of the hawkwatch.
Continuing about books for hawkwatching:
I would be remiss If I didn't mention a few other books about hawks. Hawks in Flight by Pete Dunne, David Sibley and Clay Sutton, is an excellent book with discussion and comparison as well as drawings and photo's. North American Raptors by Brian K Wheeler & William S Clark has some wonderful photo's and descriptions. For those out there that want to understand Flight Strategies of Migrating Hawks, Paul Kerlinger has a complete detailed description, however a bit technical for beginners.
Evening Watch:
At 6:20P 13 TV's flew into the valley and finally landed in the vicinity of Pecoff Farm. At 7P, 20-30 Swainson's Hawks descended into the Tamarisk Trees lining Borrego Valley Rd at the Roadrunner Tree Farm.
Prediction:
Winds should be light tomorrow so the hawks will probably kettle up together between 8:15-9A. Best viewing from the morning site on Di Giorgio Rd or on Henderson Canyon and Borrego Valley.
Swainson's Hawk photo by Sabina Harte
Thursday, March 26, 2009
Migration Today:
Swainson's Hawks - 187
Turkey Vultures - 21
Discussion:
I left my home at 6:15A with the bander, searching for roosting SW's. We did not locate one hawk in a tree to tempt to a trap. We did see hawks flying near the potato fields. At 8:15A Swainson's Hawks were in flight from several locations including the date farm, Ellis, Seeley and Viking farms as well as somewhere south of Borrego Valley. Most of the hawks came from Seeley and Viking farms (new roosting locations). Several watchers relocated 1 1/2 miles north to view large kettles of hawks close-up. Many hawks continued to stream out of Seeley. At 11:03A agroupof Swainson's Hawks streamed north along the Indian Head corridor.
I have been asked about the best hawk identification books. Below are two that I use frequently.
I am giving a hawk lecture about the watch, hawkwatching and identification at the Community Library in the main mall south of Palm Canyon Drive, Borrego Springs, this Saturday at 2P. The lecture is free.
Evening Watch:
We had around 50 people waiting for a big evening but only 8 Swainson's Hawks. They came into the east Tamarisks and the date farm.
Prediction:
We are still waiting for the big day. Hopefully some hawks came in late this evening. Winds will be light tomorrow. Lift-off probably between 8 and 8:30A. Come to the morning site for the best view.
Wednesday, March 25, 2009
Migration Today:
Swainson's Hawks - 24
Discussion:
Two SW's were located next to Borrego Springs Rd (near Pecoff). Traps were placed beneath the birds but they did not respond. Swainson's Hawks kettled up from the date farm after 9A. Several hawks were spotted from an airplane traveling northwest through Coyote Canyon by our flying ranger. During the next week we will hopefully witness several hundred migrating Swainson's.
Below is a map of the route of several Swainson's Hawks in the mid-1990's that were radio tracked using a satellite system. It is interesting to study the migration pattern of the hawks. Swainson's Hawks migrated an average of about 7,426 miles in their northward journey, traveling an average of 93 miles daily. A full account of the study can be found in the Journal of Avian Biology 29: 433-440, Copenhagen 1998. It is hoped that we will put transmitters on a few hawks in the future. Everything we can learn about the hawks will help conserve them.
Evening Watch:
A very windy evening brought many Swainson's into the valley. At 6:30P several SW's were spotted above Ellis Farm and the potato fields. At least 70 SW's were counted. Another 24 SW's were observed coming to roost at the date farm along with 22 Turkey Vultures. The total Swainson's in the valley is between 90 and 125.
Prediction:
Tomorrow's forecast is "windy, west wind at 10-20mph with gusts to 35. Viewing locations include the evening site on Borrego Valley Rd and the junction of Henderson Canyon Rd Borrego Valley Rd. The morning site on DiGiorgio may be good as well. The hawks could kettle up at several locations. You might want to check at the morning site to see if any hawks have been captured. Morning wind may get the birds up very early (between 7 and 8A.)
Tuesday, March 24, 2009
Migration Today:
Swainson's Hawks - 2
Turkey Vultures - 6
Discussion:
It looks like a TV day, not a SW day as the shot below suggests. Only a mother vulture could love this bird. Lift-off just after 8A. Almost all of the raptors moved west and out through Palm Canyon. The lack of hawks during this peak period suggest that the tremendous winds of Sunday may have backed up the migration or hawks migrated elsewhere.
Evening Watch:
Once again a light evening. Six Swainson's Hawks came in late to the date farm and probably Pecoff Farm. Four TV's were feeding on a carcass near Palm Canyon Drive.
Prediction:
Hopefully late arrivals came in. We are still waiting for the big day.
Monday, March 23, 2009
Migration Today:
Swainson's Hawks-41
Turkey Vultures 17
Discussion:
Finally the wind died down and we had a more normal flight. at 8:40A several Swainson's Hawks began to kettle up from the east side of Ellis Farm and the potato fields. All of the hawks moved in a northerly direction to Coyote Mountain and then northwest through Coyote Canyon. We were fortunate to see another captured hawk up close. After taking blood samples a few feathers and measurements, the hawk is banded and released. After release the hawk moved west and north probably joining other migrants.
Evening Watch:
Only 2 Swainson's and 6 TV's came in to roost at the date farm. Hopefully many more SW's are on the way.
Prediction:
Hopefully we will be surprised tomorrow. We are still waiting for the big day. It is possible that the windy weather held up hawks to the south.
Captured Swainson's Hawk (photo by Hal Cohen)
Sunday, March 22, 2009
Migration Today:
The Hawkwatch was called off early today, due to high winds.
Discussion:
A number of Swainson's Hawks flew low in all directions from the east Tamarisks this morning. It was difficult to determine which hawks were migrants. The wind continued all day with gusts to 60 mph and above. My wind gauge stopped sending data in the mid-50's. It is now broken. I was asked a question about the capture of the Swainson's Hawks. The photo below shows a small trap designed to capture the hawks without harming the mouse bait or the hawks. The live mouse is put in the cage and loops of monofiliment line are tied to the top. When a hawk drops from a perch to take the mouse, the bird will get its talons tangled in the line. The bird is removed immediately and is banded and data is taken. The hawk researcher will be in Borrego Springs for another week attempting to capture Swainson's Hawks.
Evening Watch:
With winds howling out of the northwest it was difficult to watch from the evening site. A few of us went to the east Tamarisks in search of Swainson's. We did see several on the ground and some birds attempting to fly into the wind, so we know there are many Swainson's Hawks in the valley.
Prediction:
High wind through tomorrow may slow down migration. Although there are many Swainson's Hawks in the area, most may remain in the area feeding. Tuesday the forecast is for light wind. It is possible that Tuesday could be a big migration day. If you are in the valley tomorrow, you might want to check in at the morning site early to learn of the best place to view hawks. Driving east on Henderson Canyon Rd may be the best site at this time.
Trap for Swainson's Hawks (photo by Hal Cohen)
Saturday, March 21, 2009
Migration Today:
Swainson's Hawks-29
Discussion:
Most of the hawks came up from the potato fields. A few came out of the date farm and drifted east before joining the others. We still have trouble picking up the Turkey Vultures. They seem to elude us by either leaving early or changing roost sites. There are caterpillar feeding opportunities to the east along Henderson Canyon Rd and the potato farm. Below is the pupal stage of the White-lined Sphinx Moth. The caterpillars fatten up and burrow into sand to pupate.
Evening Watch:
Uneventful until we got a call around 7P that at least 82 Swainson's Hawks were in the Tamarisks far to the east near the potato fields. They probably are roosting there this evening.
Predictions:
It should be very windy tomorrow with early lift-off. There are caterpillars scattered throughout the valley. We believe that the 82 plus Swainson's observed late may settle to the east. Viewing along Henderson Canyon Rd east of Borrego Valley Rd may be good. You can check in early at the morning site on DiGiorgio Rd to get up-to-date information. We are due for a large group of Swainson's. To date we have counted more than 1,300 SW's this season.
White Lined Sphinx Moth Pupa
Friday, March 20, 2009
Migration Today:
Swainson's Hawks-44
TurkeyVultures -17
Discussion:
Very little wind again today so lift-off was late (9:10A). Several watchers came out to both the morning and evening site. Joe Hopkins had a nice group that he shared the history of the watch with. Several Swainson's Hawks flew from the date farm east, spending time increosotebushes or on the ground. They began to kettle and drift north directly over the watchers at the evening site.
We were fortunate to have Chris Briggs and Cynthia Downs (holding the hawk below) bring out a captured Swainson's Hawk. He is a PhD Candidate working with Swainson's Hawks.For more information concerning his work check out www.swainson.org. Here is some of the research information:
We hope to use satellite transmitters to look at the correlations between body condition and migration timing. We can predict that individuals in better body condition will depart from Argentina earlier because they can better withstand the hardships of migration. Earlier departure may give these individuals a better chance at successfully reproducing on their breeding grounds.
We can further predict that the earliest individuals observed along a migration route will similarly be in better condition than those observed later. By trapping along the migration route, we can determine if this prediction is correct. Specifically, we are working with the Borrego Springs HawkWatch to set up trapping and test this prediction.
Chris will continue banding in Borrego Springs for another week or so.
Evening Watch:
We had more hawkwatchers than hawks this evening. Although it was pleasant evening only 5 TV's and 5 Swainson's Hawks showed up. The weather will change over the weekend and hopefully bring in many birds.
Predictions:
Aside from the 5 TV's and 5 SW's hawks it is hard to predict what will show up tomorrow. It is possible that Swainson's Hawks stopped at sites south of the valley. We are now entering the prime time for migration. Don't let one evening keep you away. Our expectations for a major migration are high.
Thursday, March 19, 2009
Migration Today:
Swainson's Hawks-225
Turkey Vultures 1
Discussion:
Swainson's Hawks were found in several trees lining Henderson Canyon Rd early in the morning. I couldn't pass the shot below. Several hawks flew down to the ground to feed. Many birds relocated further east. Lift-off was late (9:37am). I have decided to use daylight saving time for future messages. The hawks congregated in 4 kettles thatmeandered back and forth making counting difficult. Many streamed east only to reappear north or south of the watch. Finally the hawks began to move west and north out of the valley.
Evening Watch:
A very pleasant evening with lots of new watchers. They weren't disappointed as a late group of Swainson's Hawks and 7 Turkey Vultures descended into the date farm. At least 50 Swainson's Hawks joined the TV's directly above our watchers.
Predictions:
Tomorrow could be a bit windier so an early departure is likely. Don't expect the hawks to leave at 9:30A. I would shoot for 8-9am. The 50 SW's could be joined by additional late fly-ins. A shake up in the weather is expected this weekend as wind and lower temperatures are predicted. A high of 62 for Sunday. Best viewing is probably from the evening site on Borrego Valley Rd. tomorrow.
Wednesday, March 18, 2009
Migration Today:
Swainson's Hawks -166
TV's - 1
Discussion:
Yesterday evening all of the hawks roosted in Tamarisks on Henderson Canyon Rd. close to the day watch site. Ravensharassedthe hawks in the trees and on the ground. Many SW's appeared to be eating on the ground. At 9:20A daylight time, the hawks began to kettle up in a clear sky with calm wind. The hawks meandered around searching for thermals. At one point we viewed 3 large kettles. Hawks streamed back and forthcoalescingthen breaking apart again. Finally all of the hawks streamed west directly above the watch and out of the valley in a northwest direction.
Here is a good training picture taken today. How many hawks can you count. Don't try counting them individually. In real time you wouldn't have enough time. It is much easier to
count them when they are not spinning around. If in a kettle as the picture depicts, you can still count them by taking a figure (5 would be good here) and look for how many 5's you can see.
Evening Watch:
Well, we had another great evening event. At 6:40P we spotted a huge kettle of Swainson's Hawks northwest of the evening site. I drove to the day site to find the hawks dropping into the Tamarisks directly west of the count site (very convenient for tomorrow's count). It was difficult to count the hawks as they did not stay up very long. Estimates range from 175-225 SW's. A few TV's were also observed roosting at other sites.
Predictions:
Tomorrow should be partly cloudy with light winds. We should see lift-off sometime between 8:30A and 9:30A. However, if the hawks are inclined to eat caterpillars, they may leave earlier. It is possible that this could be our biggest count day this season.
Tuesday, March 17, 2009
Migration Today:
Swainson's Hawks - 41
Turkey Vultures - 9
Discussion:
No clouds today with calm wind conditions. Birds came up from Pecoff Farm, the date farm and potato fields. First lift-off at 8:30A hawk-time (standard). Lots of aerial feeding before departure from the valley.
Evening Watch:
A calm, warm evening. At 6:40P a large kettle of Swainson's was sighted due west of the watch. Counts ranged from 90-132. Someone asked me to share what we see on many evenings. So here is a series of photos taken this evening. The first shot is of over 50 of the large spinning kettle. I chased the hawks to get a shot of them coming down to roost. The second shot is of the hawks descending after a glide. The third shot is near tree top as they start to drop into the tamarisk trees along Henderson Canyon Rd.
Beginning Friday evening we will have someone stationed at the evening and day site to share information about the hawk watch. Because of daylight savings time we meet at 6P for evening sessions. Join us any evening or morning (8A-11A). I will be giving a talk on the hawks at the town library on Saturday March 28 at 2PM.
Predictions:
Most of the SW's are roosting west of Borrego Valley Rd near Henderson Canyon Rd. Please do not disturb the birds near the road. I suspect that the best place to watch take-off is from the Di Giorgio daytime watch hill. Many of the SW's have gone northwest from Di Giorgio and probably will feed in Coyote Canyon before departing.With light winds tomorrow, lift-off will be somewhere between 8:30A and 9:30A daylight time.
Borrego Valley Evening Watch-50 of over 100 Swainson's at 6:45P 3/17/09 |
Borrego Valley-Coming to roost on Henderson Canyon Rd. 7:00P 3/17/09 |
Borrego Valley-Almost touch down at 7:10P Henderson Canyon Rd. 3/17/09
Monday, March 16, 2009
Migration Today:
Swainson's Hawks -125
Turkey Vultures - 41
Discussion:
The hawks and TV's came up from 3 different locations today. Many of the hawks spent the night in the Ellis Farm and date farm. Several hawks from Ellis moved early to flower fields near Coyote to feed on caterpillars. Hawks began to kettle up to aerial feed on ants as well. Thirty-seven SW's from the date farm kettled up and streamed out of the valley. Forty-one TV's were observed coming out of EucalyptusTrees east of town.
Evening Watch:
Only 12 Swainson's Hawks came into the date farm to roost this evening.
Predictions:
It is possible that additional hawks may arrive at the caterpillar feeding area west of Henderson Canyon Rd. Some of the SW's in the date farm can be seen from the evening site. Perhaps there are more hawks than counted.
Sunday, March 15, 2009
Migration Today:
Swainson's Hawks - 224 (Our highest count this year)
Osprey - 1
Discussion:
I arrived at the potato fields at 7:30A. The wind was howling out of the Northwest. Swainson's were already on the move when I arrived. Within a half hour over 80 SW's kettled up and were driven east. They became dots and streamed out to the North. Additional SW's began to move throughout the next 2 hours. No photos with the nasty wind today.
Our hawk bander is due in town in a few days. Last year he captured 3 SW's. Hopefully he will be successful this year.
Evening Watch:
I gave a hawk talk at the local RV Park (The Springs) and arrived at the evening site at 6:50P with a group of folks. The Springs is located adjacent to the date farm. Hopefully some of those folks will turn into hawkwatchers as their location is perfect to intercept roosting hawks. Several SW's moved from Ellis Farm to the Date Farm. At least 44 SW's made the move. Additionally there are many SW's still at Ellis.
Predictions:
The wind should decrease tonight and become light tomorrow. We should see anywhere from 44-90 SW's leave both from the date farm and Ellis Farm. With a light wind the hawks will probably be on the move between 8 and 9A.
Saturday, March 14, 2009
Migration Today:
Swainson's Hawks - 12
Red-tailed Hawks - 2
Sharp-shinned Hawk - 1
Discussion:
The SW's were actively feeding on a calm, warm day. A group of 8 SW's came in from the southeast and began feeding and left late (9:30A-hawktime). Below are a few photo's taken by Eric Kallen on Friday.
Evening Watch:
This evening at 6:30P we watched as several Swainson's Hawks and TV's descended (estimated number-over 70 SW's) into Ellis Farm at Henderson Canyon Rd and Borrego Valley Rd. Most of the birds in the initial group are located near the recently sprayed potato farm. We drove to the back of Ellis Farm to watch at least 60 SW's fly from Coyote Mountain to another location. When we left the area at 7:15P, SW's were still flying in to roost. Several TV's were in the group. The Swainson's were probably feeding on caterpillars north of Henderson Canyon Rd. Below is a photo of part of the first group.
Predictions:
Tomorrow should be quite a lift-off from the Ellis Farm. An estimate of 125-200 SW's and an unknown number of TV's is expected. The best place to view the hawks will probably be on Borrego Valley Rd, near Henderson Canyon Rd.
Friday, March 13, 2009
Migration Today:
Swainson's Hawks - 63
Discussion:
Considering the number of hawks that we observed yesterday evening, we definitely had more than anticipated today. The SW's that roosted in the tamarisks near Henderson Canyon Rd and Borrego Valley Rd. cooperated by kettling up directly above the waiting watchers. Almost all of the hawks streamed to the burn area, kettled again, turning North then Northwest along Coyote Mountain before departing the valley. One of the perched SW's dropped to the ground and apparently picked up a rodent. The bird spent 15 minutes tearing up the meal before departing. Photo opportunities were boundless today. See photos below.
Tomorrow morning at 6A, helicopters are scheduled to begin spraying the potato fields adjacent to Borrego Valley Rd on the east side. Anyone that has lung problems or allergies may consider not coming to the valley tomorrow. I do not know what they will be spraying but they use several different poisons to control beetles and other insects. Often we have observed Swainson's Hawks feeding on the dead insects in the potato fields. This is an ongoing problem that Agri-empire has been involved in for several years.This week we have had 3 days of burning by Ellis Farms and now spraying-by Agri-empire. When will it stop?
Evening Watch:
A beautiful evening but not eventful. A mystery buteo did fly in that will need identification tomorrow. At 7:15P 2 Swainson's Hawks descended into the date farm. Late arrivals are very common. It is also possible that we missed birds in the very low light.
Predictions:
We are hopeful that there will be SW's that came in late.
Thursday, March 12, 2009
Migration Today:
Swainson's Hawks - 10
Turkey Vultures - 6
Discussion:
All of the hawks flew to the agricultural slash fire at Ellis Farms. They circled up in the heat created by the fires, before departing the valley. The Turkey Vultures were observed northwest of the hawkwatch. Below is the caterpillar of the White-lined Sphinx Moth. They are in abundance at the entrance to Coyote Canyon. By this weekend most of the wildflowers in that area will have been eaten. We will be watching for SW's going to that area to feed.
We are now waiting for the big migration push. In the next 2 weeks, we should see hundreds of Swainson's in the valley.
Evening Watch:
An interesting evening. From the evening site we watched several Swainson's Hawks low and near the burned area at Borrego Valley Rd and Henderson. We drove to the area and counted conservatively 35 SW's but the number could be up to 60. The best viewing spot tomorrow will be from the intersection of Borrego Valley Rd. and Henderson Rd. It is possible that these birds are attracted to fried food in the burn area. Also we will check at the beginning of Coyote Canyon for birds feeding on the caterpillars. It should be a good morning but beware, if the wind is up they will be in the air by 7:00A
Wednesday, March 11, 2009
Migration Today:
Swainson's Hawks - 34
Turkey Vultures - 7
Discussion:
The Swainson's came up after 9A from the date farm. They began to aerial feed on flying ants before heading north to the new burn area. TV's in two small groups took off from the date farm as well. The SW's kettled into the smoke and heat generated by the fire. They reached a height and streamed Northwest toward Coyote Canyon. The fires may attract additional SW's as the day progresses.
Evening Watch:
Only 4 Swainson's Hawks were observed near the vicinity of the fire. Hopefully additional SW's will fly in late. We will check for hawks near the burned out area early tomorrow.
Fires at Ellis Farm. Over 30 Swainson's used the heat to rise very high before migrating.
Tuesday, March 10, 2009
Migration Today - 0
Discussion:
A pleasant day but no apparent migration.
Evening Watch:
I just left the evening watch. A calm clear evening. At 6:35P a few Swainson's Hawks began to descend into the date farm. As we scanned up we began to count several hawks. The total counted was 33. One TV was spotted as well.
Predictions:
A view from the date farm on Borrego Valley Rd should be nice for the hawks tomorrow. They probably will take off between 8 and 9A. No wind is predicted. With burning going on we may see some feeding in fields.
Monday, March 9, 2009
Migration Today:
Swainson's Hawks-37
TV's -1
Discussion:
Wind early brought the hawks up at 7:20A. Thirty-one SW's kettled up and flew Northwest and out of the valley.Additionally6 Swainson's continued to aerial feed before departing. One lone TV left by 9:30A. Below are feeding Swainson's. If you use your imagination you can see an ant in the talon of the SW in this photo.
Ant or pair of ants in the talon, we think. Photo by LeRoy Dorman
Evening Watch:
This evening only one lone Swainson's hovered above us. No other hawks or TV's were observed.
Predictions:
Unless some SW's snuck in after dark, we do not expect much of a migration tomorrow. Based on previous years, our next wave of migrants is due around March 13th.
Reaching out for ants. Photo by LeRoy Dorman
Sunday, March 8, 2009
Migration Today:
Swainson's Hawks - 3
Discussion:
Two of the hawks spent time aerial feeding. The TV's counted yesterday evening were not seen today. White-lined Sphinx Moths are beginning to show up (see photo). Caterpillars are also being observed. The Swainson's Hawks are opportunistic feeders. In Borrego Valley there are 6 sources of food: Flying ants, sphinx moth caterpillars, dragonflies, rodents, beetles and other insects killed by spraying of potato fields, and several creatures fried by palm fires (burn-offs at palm farms). Additionally there is a source of chopped up snakes, rodents and insects about 15 miles east of the watch (a farm that plows up the ground for planting).
Evening Watch:
At 6:56P we watched Swainson's Hawks begin to gather together very high. By 7:05P they descended into the date farm. The high count was 43.
Prediction:
We expect at least this number of SW's to migrate tomorrow. It is beginning to get windy so an early lift-off is probable. We will monitor the weather tomorrow and possibly arrive at the watch site by 7:30A (if windy).
Saturday, March 7, 2009
Migration Today:
Swainson's Hawks - 135
Discussion:
The weather cooperated with light winds. The lift-off of SW's began at 8:22A from the date farm. The first group of 38 Swainson's kettled up and loosely moved east, then north to Coyote Mountain. The second group of 53 SW's streamed north from the date farm and kettled close to the watch. Additionally 44 Swainson's were sighted to the southwest at 9:45A. The TV's spotted yesterday evening never showed up. It is possible that they migrated low to the west before turning north. Not a cloud was in the sky all day. I believe that migration may have continued at high altitude during the day. The flying ranger reported seeing 8 Swainson's Hawks to the east of Borrego Springs. She will be watching from the air for incoming hawks.
If you plan to come to the watch tomorrow, you might want to come at 9A. Also, we will meet at the evening site around 6PM instead of 5PM.
Evening Watch:
This evening only 3 TV's and 1 SW was observed.
Prediction:
Tomorrow should have light winds but no expectations of a big flight. Winds will pick up in the afternoon and continue through Monday. We have had significant flights on windy days.
Friday, March 6, 2009
Migration Today:
Swainson's Hawks-4
Turkey Vultures-21
Discussion:
Lift-off of SW's at 8:15. The TV's came up in small groups with no real kettles forming. It was windy, cool with virtually no clouds. The winds have continued all day.
Evening Watch:
This evening we are posting our first Spring Alert. At 4:30P we watched 13 TV's arrive at the date farm with 3 Swainson's Hawks. By 5P we counted 48 SW's. By 5:15P the number increased to at least 75. Additional Swainson's continued to come in. For 1/ 1/2 hours we watched as the SW's descended into the date farm only to rise up again. They spread out all around us in the diminishing light. Below are two shots taken at 4:45P and 5:30P. The numbers may exceed 125 SW's and 13 TV's. The temperature dropped into the 50's and wind gusts to 35 made it tough to count the Swainson's.
Predictions:
The Swainson's Hawks may have split into groups roosting at the date farm, Ellis Farm and Pecoff Farm. We hope they are concentrated at the date farm. If the wind continues in the early hours tomorrow, the SW's will probably get up early. I will be at the watch site by 7A if it is windy. With little or light wind take-off should be between 7:45A and 9A. Don't be late!
Thursday, March 5, 2009
Migration Today:
Swainson's Hawks - 1
Turkey Vultures - 12
Discussion:
The morning started very windy. It is possible that there was an early migration of TV's. Most of the TV's counted came in just before 10A from a distance and very high. We believe that there is a roosting site about an hour south of Borrego where the late TV's are coming from. Only one low flying Swainson's Hawk was observed.
Several new hawkwatchers are on our list. At this date we have over 300. We will be developing a website by the end of the season. For the new folks, here is information about the location of both the day and evening site:
The day site is on DiGiorgio Rd about 2.8 miles north of Palm Canyon Drive. We are at the site every day through April 15 from 8-11A. On Sunday March 8 the time will change. We probably will come out a little later (8:30A) beginning Sunday. We will always use hawk-time (one hour earlier than daylight savings time) for our count. As the season progresses, we will get out earlier to watch for early migrants.
The evening site is located about 1.8 miles north of Palm Canyon Drive on Borrego Valley Rd. We meet about one hour before sundown. As of Sunday we will meet around 6P because of the time change.
Evening Watch:
An interesting evening watch. From a location 2 miles south of the evening watch site, I spotted 37 TV's coming to roost in the Roadrunner Mobile Park. Additionally 4 Swainson's were spotted.
Predictions:
We should have a nice kettle of TV's and perhaps some Swainson's. If it is windy again, takeoff will be early.
The peak of migration is a week or so away. Take a look at Hawkcount.org to view data from the past 7 years. Scroll down to Borrego Valley.
Wednesday, March 4, 2009
Migration Today:
Swainson's Hawks - 3
Turkey Vultures - 6
Discussion:
We had very windy conditions early. Hawks were flying by 7:20 am and probably even earlier. Swainson's were observed at a few locations but were not observed from the hawkwatch. Winds should continue through Thursday.
Evening Watch:
Nine TV's and only 1 Swainson's Hawk were observed near the date farm.
Predictions:
Not much to report. We are waiting for the big migration push in the next few weeks.
Tuesday March 3, 2009
Migration Today:
Swainson's Hawks - 9
Turkey Vultures - 12
Discussion:
Winds early brought the TV's up by 7:20A. A Northwest headwind pushed both the SW's and TV's west against the mountains. Two of us checked out a high site to watch migration through Indian Head Estates. In the future this and other sites closer to the mountains might help us locate migrants.
Evening Watch:
At least 20 TV's and 7 SW's flew into the valley. The TV's settled into the date farm.
Predictions:
Migration of Swainson's Hawks continues to be slow.
Monday March 2, 2009
Migration Today:
Swainson's Hawks - 11
Turkey Vultures - 4
Discussion:
A few SW's migrated at 9:15A followed by a group at 10A. Thirty SW's were reported at the beginning of Coyote Canyon. With more wind and a front this weekend, we should see the migration pick up. Historically our first good wave of SW's should be between March 7-10.
Evening Watch:
Four Swainson's Hawks came close to the watch. No other migrants were observed.
Predictions:
Hopefully the changing weather pattern will bring in some migrants.
Sunday March 1, 2009
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Migration Today: Discussion: |
Turkey Vulture near Hawkwatch Hill by Hal Cohen |
If visiting the hawkwatch it is best to come early and wait for lift-off. Often folks turn up at 10A or 11A and are disappointed. 90% of the raptors are on the move by 9A.
Evening Watch:A beautiful evening but no incoming birds. Of we could be surprised tomorrow as we were today. Below is a nice close shot of a beautiful Turkey Vulture taken near the day site by me.
Saturday February 28, 2009
Migration Today:
Swainson's Hawks - 6
TV's - 2
Discussion:
All the SW's began aerial feeding shortly after 9A. Both the SW's and TV's probably roosted near the date farm.
The unofficial totals for the month of February are:
Swainson's Hawks - 146, just over 68% of average (213)
Turkey Vultures - 318, just over 96% of average (332)
Red-tailed Hawks - 10, average 10
Red-shouldered Hawk - 1, first migrant recorded at the watch
Sharp-shinned Hawk - 1
Cooper's Hawk - 1
Prairie Falcon - 1
Total Raptors counted in February - 478
We have used figures from the complete data 2004-2008 to produce the numbers above.
Although we did not see any apparent migrants last night, we did have feeding Swainson's Hawks today and a few TV's.
Evening Watch:
A Peregrine Falcon and 4 Swainson's Hawks were observed. The roost site for the SW's was not determined.
Predictions:
March is historically our busiest migration period. The peak of migration occurs around the middle of the month.
Friday, February 27, 2009
Swainson's hawk in Borrego, photo by Eric Kallen
Migration Today:
Swainson's Hawks 13
Red-tailed Hawks 3
Red-shouldered Hawk 1
Discussion:
It appears that the SW's that we observed coming to roost last night did not descend into the date farm. They apparently roosted west of Pekoff farm. Only 13 SW's were counted today moving low to the west before migrating out of the valley. The photo below was taken on Borrego Springs Road by Eric Kallen. This Swainson's and several others were close to the road this morning. None of the TV's observed yesterday evening could be found today.
Evening Watch:
No Swainson's Hawks or TV's were observed coming into the valley. Of course we have had surprise migrations in the past, so don't lose hope.
Thursday February 26, 2009
Migration Today:
Swainson's Hawks - 16
Turkey Vultures - 11
Red-tailed Hawk - 1
Prairie Falcon - 1
Discussion:
The winds early got the SW's up and feeding a little after 8 AM. The TV's had left their roost at the date farm before 8 AM and moved to De Anza golf course. We had a nice look at a Prairie Falcon moving north. At 8:45A the early SW's were joined by high flyers and left the valley. Finally the TV's moved north and out of the valley.
Evening Watch:
A nice evening drop-in of Swainson's Hawks. At least 21 were counted. The hawks came in at 5:20P and stayed aloft until 5:55 PM. They descended into the west side of the date farm. Several TV's were observed early but not counted.
Predictions:
Tomorrow we will see a nice lift-off of SW's and TV's. If you are joining us, watch the wind forecast as the hawks and TV's will take off early if it is windy. Somewhere between 7:45 AM and 9 AM the raptors will be on the move.
Wednesday February 25, 2009
Migration Today:
Swainson's Hawks - 4
Turkey Vultures - 88
Red-tailed Hawks - 5
Cooper's Hawk - 1
Discussion:
A nice lift-off at 8:40A from the date farm. The TV's kettled up and streamed above the hawkwatch. They were joined by 4 Swainson's Hawks, all aerial feeding on ants. The Red-tailed Hawks moved through at the same time including one Cooper's Hawk.
Evening Watch:
Only 11 TV's came into the date farm.
Predictions:
Expect some TV's and hopefully SW's that may have come in late.
Tuesday February 24, 2009
Migration Today:
Swainson's Hawks-48
Turkey Vultures -66
Discussion:
As predicted, the number of SW's and TV's exceeded the number counted coming into roost the evening before. At least half of the SW's may have roosted further east of the date farm. At 8:45A several Swainson's Hawks circled up and began feeding on flying ants. Below are a female and male ants copulating. Stretched head to head they are about 3/4 of an inch in length. Are the SW's selecting a bigger package (2 for 1 deal)? We don't know. Reports are coming in of flying ants throughout the valley.
The early migration we are witnessing is interesting. Climatic weather changes? Flying ants?
Evening Watch:
This evening at least 45 TV's came into the date farm to roost. No Swainson's were observed, however some may have come in late. Some may have roosted again to the east.
Predictions:
Watch for a nice kettle of TV's tomorrow with hopes for SW's as well.
Monday February 23, 2009
Migration Today:
Swainson's Hawks - 13
TV's - 22
Discussion:
The Turkey Vultures moved about the valley for an hour before departing at 9:15A. They left in loose groups of 1,2 and 3. The SW's kettled up and began feeding at 9:30A. They fed on flying ants for almost an hour before departing the valley. Although we didn't have a lot of raptors, the close approach of the Swainson's made up for lack of numbers.
Evening Watch:
Another good arrival this evening. Over 50 TV's and anywhere from 25-50 Swainson's Hawks came into the valley late and are roosting at the date farm.
Predictions:
Tomorrow should be a fine day to watch both the TV's and SW's take off. The Swainson's Hawks will probably linger in the valley aerial feeding on flying ants. Take off will depend on wind velocity, anywhere from 8-9:30A. Temperatures still continue in the upper 70's so wildflowers are beginning to show up in numbers. Sphinx moth caterpillars have not been found yet but are due in a few weeks. When available the Swainson's Hawks will ground feed on the caterpillars.
Sunday February 22, 2009
Migration Today:
No hawks counted migrating today
Discussion:
The TV's that came in last night spent the day in the area. The weather remained cloudy all day with little wind.
Evening Watch:
This evening we watched 5 TV's relocate from the Ellis Farm to the Date Farm. Additionally at least 10 TV's remained at Ellis. Five Swainson's Hawks also flew into the Date Farm from Ellis.
Predictions:
Tomorrow should be better for migration. We expect a partly cloudy day with light wind. At least 15 TV's and 5 SW's were counted in roosts. From past experience there probably are more Swainson's in the area.
Saturday February 21, 2009
Migration Today:
Swainson's Hawk - 1
Discussion:
We have had very little migration over the past few days. Hopefully with the TV's that came in today we will see more Swainson's. A Prairie Falcon flew past the watch today but did not migrate. Flying ants were observed today (a favorite food of the Swainson's Hawks).
Evening Watch:
17 Turkey Vultures flew in and are roosting in a dead tamarisk northwest of the date farm. Swainson's Hawks and TV's often fly together so it is possible that some SW's are in the area.
Prediction:
Look for the TV's and keep a lookout for more SW's
Wednesday February 18, 2009
Migration Today:
16 Swainson's Hawks
12 Turkey Vultures
1 Red-tailed Hawk
1 Sharp-shinned Hawk
Discussion:
At 9AM SW's kettled up from the date farm. TV's streamed in from the East to join the kettle. We did not see SW's Tuesday evening. We did see the TV's come in to roost. Often SW's will come in later, even after dark. This is the second early migration in a week. If you would like to view all of the count data for our hawkwatch and most hawkwatches across North America, go to Hawkcount.org. Scroll down to Borrego Valley and take a look at data going back as far as 2003. Hawkcount.org is sponsored by Hawk Migration Association of North America.
Evening Watch:
This evening we had no apparent migrants come in to roost.
Predictions:
We do not expect large numbers of migrant raptors tomorrow. However we have been surprised in the past as SW's could come in late or roost elsewhere.
Tuesday February 17, 2009
Migration Today:
Nothing
Discussion:
Migrants were not expected today after the stormy weather yesterday. I have received several messages asking for directions to the day and night site. Below is a picture of the "Hawk Hill". If you have an endearing name for this structure please share it with us. Every year Mike Spikerman, the manager of Roadrunner Tree Farm, sends out a tractor to reconstruct the hill. This year we can accommodate at least 10 people with scopes. Everyone must sign a waiver form once during your first visit.
Directions to the day site:
Going east from downtown Borrego Springs on Palm Canyon Drive, take a left turn at DiGiorgio Rd. Travel 2.8 miles north to the site (right side of the road). Be careful that you don't park in a soft sand area. We will be at the site from 8A to 11A daily. If it is windy we will be at the site as early as 6A. Almost 90% of the migrants leave the valley between 8 and 10A.
The directions to the evening site:
Going east from downtown Borrego Springs on Palm Canyon Drive, take a left at the stop sign at Borrego Valley Rd. Travel 1.5 miles north past the date farm on the left to a dune on the right. Again watch out for soft sand. We are asking everyone to come up to the dune from the south side to protect the windward side.
Evening Watch:
This evening we did have 12 TV's come into the date farm.
Predictions:
The weather will be warmer with light wind tomorrow. At least 12 TV's will probably migrate. It is still early for migration. Mid-March is the peak period. If you plan to come to Borrego Springs for the Hawkwatch and flowers, make an early hotel reservation. Weekends are going to be crazy this year because of the wildflowers. Predictions for the flowers this spring are excellent to remarkable. The flowers. The desert is green already. More rain is predicted Sunday and Monday. I saw a White-lined Sphinx Moth today, of which the caterpillar stage is a favorite of Swainson's Hawks.
