Friday, March 27, 2015

Two Weeks of Solid Hawks!!! March 21-28, 2015

Leaders:
March 21-Rose
March 22-Wes
March 23-Herb
March 24-Steve
March 25-Laura
March 26-Pam
March 27-Hal

Migration:
March 21-176 Swainson's Hawks; 2 Turkey Vultures
March 22-224 SW's
March 23-19 SW's
March 24-502 SW's; 1 Red-tailed Hawk; 1 Osprey
March 25-292 SW's; 4 TV's
March 26-121 SW's
March 27-471 SW's; 4 TV's; 4 Unidentified Raptors

Discussion:
Another remarkable week with daily reports of large kettles of Swainson's Hawks both in the flower fields (feeding on caterpillars) and migrating. Finally today we might have cleared out some of the hawks that were lingering in the area feeding. We will see if new hawks enter the valley today and this evening. The weather continues to be very hot with temperatures in the 90's and total blue skies. Tomorrow the temperature may crack 100. There has been very little morning wind and it appears that thermal production was minimal. The hawks appear to struggle upwards before using updrafts along the Santa Rosa Mountains. Most of the migration has been along the mountains. Below are some youtubes of a typical caterpillar digging in and an evening kettle.

We cannot predict the outcome of the next few weeks. This evening will tell the tale. I might update this blog if new information surfaces this evening. Oh oh, it's almost 6P and I just got word that over 200 hawks came in!!!

 http://youtu.be/S3J6jxb1Xks      http://youtu.be/dxIzfe0YDew

Juvenile Light Intermediate-HC

Evening at the Watch-HC

Beautiful Turkey Vulture-Gary Hilton


Friday, March 20, 2015

Unusual Week-Many Hawks Spending Time In Town-March 13-March 20, 2015

Leaders:
March 13-Rose
March 14-Hal
March 15-Wes
March 16-Herb
March 17-Laura
March 17-Steve
March 19-Joe
March 20-Hal

Migration:
March 13-0
March 14-116 Swainson's Hawks
March 15-52 Swainson's Hawks; 34 Turkey Vultures
March 16-145 Swainson's Hawks
March 17-192 Swainsons's Hawks
March 18-0
March 19-9 Swainson's Hawks
March 20-326 Swainson's Hawks

Discussion:
Almost every day we had Swainson's Hawks on the ground feeding on caterpillars. The caterpillars of the White-lined Sphinx Moth must be very tasty. Hundreds of hawks have been staying in the valley eating the critters. See the life history below. So each day we have some migrants, some hawks staying and new hawks entering the valley. Hawks are arriving all afternoon. They most likely see other hawks on the ground and zero in on the feeding grounds. It has been a chore to count hawks this season. Mainly because of the change in typical behavior. Only a fraction of the hawks on the ground migrate each day. As of March 20th estimates of the number of hawks in town is around 600. I have been raising some of the caterpillars (feeding them California Primrose from my yard). They now have entered the Pupa stage. I am patiently waiting until they become adult flying moths. I began the project March 10. Also below is the adult Painted Lady and the Chrysalis (same as pupa). There are perhaps a few hundred thousand Painted Ladies in the valley. Check out the Youtube for March 13-http://youtu.be/isKSi24qOrw

Typical Moth Life Cycle

Adult White-lined Sphinx Moth-HC
Moth eggs on underside of a leaf
Sphinx Moth from an egg-Iris Kilpatrick
Pupa of the Sphinx Moth-Light Brown-Upper Caterpillar becoming Pupa-HC
Painted Lady Butterfly Just Before Adult Emerging-HC
Painted Lady Just Emerged on Pin-Cushion Flower-HC
Sphinx Moth Tracks-HC
Nice Shot of a Swainson's Hawk-Barbara Barnes

Thursday, March 12, 2015

A Wild Week-Caterpillars Everywhere and Hawks Feeding on Them-March 7-13, 2015

Leaders:
Saturday March7-Rose
Sunday March 8-Wes
Monday March 9-Herb
Tuesday March 10-Steve
Wednesday March 11-Laura
Thursday March 12-Joe

Migration:
Saturday-466 Swainson's Hawks; 24 Turkey Vultures; 1 Red-tailed Hawk
Sunday-141 SW's
Monday-220 SW's; 29 TV's; 1 Red-tailded Hawk; 1 Peregrine Falcon; 1 Prairie Falcon
Tuesday-449 SW's
Wednesday-8 but might be updated
Thursday-Around 600 SW's

Discussion: The flowers are blooming and hundreds of thousands of caterpillars are eating the flowers. Hawks are all over the valley eating the caterpillars. So we have had lots of activity and migration. Separating the migrants from hawks staying in the valley to feed has been difficult. Both the day and evening events have been spectacular. Our photography-Iris Kilpatrick has produced some magnificent photo's of individual Swainson's Hawks. Channel 10 (ABC-San Diego) ran a featured segment on the flowers, caterpillars and hawks. Some of the Youtubes and an interview with Joe Hopkins were included. We expect the flowers to dwindle during the current heat wave. The caterpillars are fat and will probably dig in-pupate and spend the year underground. They will emerge next winter as moths and hopefully will experience more flowers to pollinate. Yes, the flowers depend on the moths and at the same time provide food for the growing caterpillars. Check out the current Youtubes below. This youtube was taken at 7P, yesterday March 12th. http://youtu.be/3ycsJ4NQ8F4

Iris Kilpatrick
Iris Kilpatrick

Iris Kilpatrick
Hal 

Just a Reminder-Be Careful-This Sidewinder was found at the entrance to the evening watch-run over by a careless driver. Also, watch out where you step. Our very hot weather now will bring out more snakes. 

Paratropper and SW's-Hal
Our Eyes-Steve and Rose-Hal

Friday, March 6, 2015

Results February 28-March 6th-Exciting Migration Tuesday March 3rd-399 Swainson's Hawks

Leaders:
Saturday February 28-Hal
Sunday March 1-Herb/Judy
Monday March 2-Herb/Judy
Tuesday March 3-Steve
Wednesday March 4-Laura
Thursday March 5-Hal
Friday March 6-Rose

Migration:
Saturday Feb. 28-0
Sunday March 1-0
Monday March 2-5 Swainson's; 7 Turkey Vultures; 1 Red-tailed Hawk
Tuesday March 3-399 Swainson's Hawks; 27 Turkey Vultures; 1 Red-tailed Hawk
Wednesday March 4-44 Swainson's Hawks; 17 Turkey Vultures
Thursday March 5-0
Friday March 6-0

Discussion:
Borrego Springs had a two day rain event-Sunday and Monday. Monday evening we expected some hawks (counted around 250) but were surprised with over 300 on Tuesday. The total of 399 included several close kettles with lots of fine viewing. The photo's below will give you an idea of the excitement. Of course we hope for a few more repeat days with plenty of hawks. Check out the Youtubes below. On Thursday we watched as several Swainson's Hawks descended into a field near the hawk watch. On Friday we counted more than 50 in flower fields. Evidently the same birds are spending time feeding on caterpillars. This evening (Friday) we counted 67 Swainson's in a field next to the date farm on Borrego Valley Rd. This is just south of the solar field. Apparently hawks are remaining in town as long as there is food available.
Typical Behavior of Swainson's sitting in an open field. This photo was taken last year. Today the same field has a number of hawks feeding on caterpillars. 
Evening Watch:
We enjoyed watching the SW's feeding in the field across from the evening site. Our high count was 67  hawks. No new birds apparently came in.

Prediction:
Wind should be calm in the morning so any flight from the date farm will take place after 8:30A. Best viewing will be from Borrego Valley Rd (night site-1.8 miles north of Palm Canyon Drive). If the hawks migrate they will cross DiGiorgio Rd near Big Horn (about 2 miles north of Palm Canyon Drive). The hawks will stream out of the date farm and kettle up to the west.


ALERT LIST:
If you would like to be placed on the ALERT list-contact Hal at Raptorhal3@gmail.com I only send out an ALERT when we have over 100 Swainson's Hawks descending into the valley in the evening. You can access data from 2003 to present at Hawkcount.org.

Thanks to Iris Kilpatrick who continues to come out to photograph the hawks on short notice. Also, thanks to Charity Hagen and Laura Webb for sharing photos.

Attached are several photo's and a two Youtubes-enjoy. All shot March-3-5, 2015

Hawkwatch Youtube: shttp://youtu.be/Swhy_cREPqs and http://youtu.be/_rlGjxBS2Fc

Yes, we still have wildflowers and caterpillars-Laura Webb
Henderson Rd March 5, 2015-HC

Caterpillars finishing off Sand Verbena-Iris Kilpatrick
Little Swainson's dots with snow in the background-HC
TV's and SW's together-March 4, 2015-HC
How Many Swainson's in Eucalyptus Roadrunner March 3, 2015-HC
Handsome SW Intermediate-HC
Great Closeup-SW-Charity Hagen
SW-Iris Kilpatrick
Best shot of a light morph SW-Iris Kilpatrick
Rufous Morph-Iris Kilpatrick
Red-tailed Hawk "Fuertes"-HC
Sunset March 3, 2015-HC



 

Friday, February 27, 2015

Slow Down As March Approaches-February-21-February 27, 2015

Leaders:
Saturday Feb. 21-Joe
Sunday Feb 22-Laura
Monday Feb 23-Herb
Tuesday Feb 24-Steve
Wednesday Feb 25-Laura
Thursday Feb 26-Joe
Friday Feb. 27-Hal

Migration:
Feb 21-3 TV's; 1 Swainson's Hawk
Feb 22-0
Feb 23-1 TV; 27 SW's
Feb 24-16 TV's; 57 SW's
Feb 25-0
Feb 26-0
Feb 27-1 SW

Discussion:
So far our number of Swainson's Hawks observed in February has surpassed the average of 174. This year falls into the fourth spot among 12 years of observation. This month we have counted 224 Swainson's Hawks. Flowers continue to be blooming profusely throughout the valley. White-lined Sphinx Moth and Painted Lady Butterfly caterpillars are munching away at the flowers. We expect very windy conditions through Saturday morning. Rain is predicted for Sunday. Monday or Tuesday could produce a nice migration. Today we spotted a Red-shouldered Hawk and a White-tailed Kite.

WE NEED A NICE USED LARGE UMBRELLA-We are looking for a large used umbrella to use at the hawkwatch. Someone walked off with our old umbrella. We have one now that is moth eaten. Preferably one that can tilt for the angle of the sun would work. However any old umbrella would do.  Let me know if you have one tucked away in the garage, getting dusty. You can contact me at Raptorhal3@gmail.com

Evening Watch February 27:
It is very windy as I write this blog account. Twelve Swainson's came in this evening along with 9 Turkey Vultures. They were airborne when the watchers left as it became dark. '

Prediction for Saturday February 28:
With the very windy conditions, it is likely that all of the Swainson's and Turkey Vultures will be up and out of the valley early tomorrow.
Very Near the Hawkwatch-HC
Verbena, Sunflowers, Lupine and other species-HC
Painted Lady Butterfly
Painted Lady Caterpillars Everywhere-HC
Sunset at the Evening Watch Site-HC

Friday, February 20, 2015

Nice Migration Thursday February 19 and Light Migration February 20

Leaders:
Thursday February 19-Joe Hopkins
Friday February 20-Hal Cohen

Migration:
Thursday-82 Swainson's
Friday-8 Swainson's; 37 Turkey Vultures.

Discussion:
The Swainson's Hawks that roosted at the Date Farm separated into a few groups on Thursday. Some of the hawks descended into the fields. A few appeared to be feeding on caterpillars. Many of the SW's remained in the trees. They began to migrate after 9A. The majority of the SW's flew over Big Horn and DiGiorgio toward the west. On Friday only 8 SW's migrated along with 37 Turkey Vultures. We did have a Ferruginous Hawk roost nearby. Flowers continue to bloom in profusion, attracting White-lined Sphinx Moth Caterpillars.

Remember, you can subscribe to this blog at the bottom of page. Also, you can keep track of the hawks at Hawkcount.org-hit monthly and scroll down to Borrego Valley Hawkwatch. You can also be placed on the alert list if we see a bunch of hawks descending into the valley in the evening.

Evening Watch: Friday-No hawks reported.


Desert Lily
Yellow Color Morph of White-Lined Sphinx Moth Caterpillar-2/20/15-HC
Green Morph-2/20/15-HC
Swainson's Hawks in Eucalyptus Tree-Count Them 2/19/15-HC
Light Intermediate SW-2/19/15-HC
Light Intermediate Joined By a Dark Morph SW-2/19/15-HC
Canadian Air Force Dropping Into Hawk Air Space-2/20/15-HC
Male and Female American Kestrel-2/20/15-HC