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Archive 2013 · Peregrin Falcon/Gyrfalcon?
  
 
UgashikBob
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p.1 #1 · p.1 #1 · Peregrin Falcon/Gyrfalcon?


Peregrine Falcon taken about 100 yards upstream from our home.




  Canon EOS-1D Mark III    EF100-400mm f/4.5-5.6L IS USM lens    400mm    f/10.0    1/1250s    400 ISO    0.0 EV  



Edited on Feb 07, 2013 at 06:32 AM · View previous versions



Feb 03, 2013 at 11:55 PM
KirkB
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p.1 #2 · p.1 #2 · Peregrin Falcon/Gyrfalcon?


Impressive IF capture of an extremely fast falcon Bob.

Kirk



Feb 04, 2013 at 12:03 AM
gsmani
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p.1 #3 · p.1 #3 · Peregrin Falcon/Gyrfalcon?


great shot Bob


Feb 04, 2013 at 12:04 AM
KCollett
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p.1 #4 · p.1 #4 · Peregrin Falcon/Gyrfalcon?


Nice grab Bob.


Feb 04, 2013 at 12:41 AM
big country
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p.1 #5 · p.1 #5 · Peregrin Falcon/Gyrfalcon?


awesome! how is the weather up there?


Feb 04, 2013 at 01:27 AM
mallardg500
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p.1 #6 · p.1 #6 · Peregrin Falcon/Gyrfalcon?


Stunning shot!!

Phoo



Feb 04, 2013 at 01:36 AM
UgashikBob
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p.1 #7 · p.1 #7 · Peregrin Falcon/Gyrfalcon?


bc:
We went tropical the day after Christmas and its been in the 20's & 30's every since. Very strange for January and February. Long range is saying more of the same. Maybe the waterfowl will be back early.



Feb 04, 2013 at 02:08 AM
birdied
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p.1 #8 · p.1 #8 · Peregrin Falcon/Gyrfalcon?


Wonderful shot !

Birdie



Feb 04, 2013 at 02:10 AM
eyelaser
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p.1 #9 · p.1 #9 · Peregrin Falcon/Gyrfalcon?


Now that is a great in your face shot...
Eric



Feb 04, 2013 at 02:17 AM
UgashikBob
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p.1 #10 · p.1 #10 · Peregrin Falcon/Gyrfalcon?


I was very fortunate as I was walking upstream to check out a fox den and this guy happened to come by and check me out. There is a pair in the area but it is a rarity to see them. Thank you for your comments.


Feb 04, 2013 at 07:16 AM
 

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kmunroe
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p.1 #11 · p.1 #11 · Peregrin Falcon/Gyrfalcon?


nicely done Bob


Feb 04, 2013 at 07:40 AM
Conrad Tan
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p.1 #12 · p.1 #12 · Peregrin Falcon/Gyrfalcon?


Always a good find!


Feb 04, 2013 at 08:52 AM
David Leask
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p.1 #13 · p.1 #13 · Peregrin Falcon/Gyrfalcon?


Nice one Bob, well done.
David



Feb 04, 2013 at 08:26 PM
UgashikBob
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p.1 #14 · p.1 #14 · Peregrin Falcon/Gyrfalcon?


Sorry for the late update but I have received a note from a local bird expert with US Fish & Wildlife and it seems I incorrectly identified an immature Gyrfalcon. After spending a lot of time looking at photos on the net I agree. Would welcome any other comments on the ID.


Feb 07, 2013 at 06:30 AM
Lil Judd
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p.1 #15 · p.1 #15 · Peregrin Falcon/Gyrfalcon?


Very nice shot

Lil



Feb 07, 2013 at 07:28 AM
Oldraven
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p.1 #16 · p.1 #16 · Peregrin Falcon/Gyrfalcon?


Can't make a call from experience because I've never seen a Gyr, but I read the length of this bird's primaries on the left wing as 9>8>10>7 and that's the formula for Gyrfalcons. Peregrine primary length follows the formula 9>10>8>7.


Feb 07, 2013 at 09:00 AM
UgashikBob
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p.1 #17 · p.1 #17 · Peregrin Falcon/Gyrfalcon?


OR:
Are you reading primary feathers lengths as a comparitve measurement? Excellent info. Is that documented anywhere? We are still trying to sort out the adult/immature issue. One bird book I have says the blue/gray feet are a immature trait and another says the blue/gray bill is a adult thing. Was told the easy way to tell them from a Peregrine is the yellow coloration around the eye/beak area on a Peregrine. Thanks for the info.



Feb 07, 2013 at 12:13 PM
Oldraven
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p.1 #18 · p.1 #18 · Peregrin Falcon/Gyrfalcon?


UgashikBob wrote:
OR:
Are you reading primary feathers lengths as a comparitve measurement? Excellent info. Is that documented anywhere? We are still trying to sort out the adult/immature issue. One bird book I have says the blue/gray feet are a immature trait and another says the blue/gray bill is a adult thing. Was told the easy way to tell them from a Peregrine is the yellow coloration around the eye/beak area on a Peregrine. Thanks for the info.


Yes, the info above pertains to the relative length of the 4 outermost primaries...sorry I wasn't clear there. Re documentation: many years ago raptor ID was my day job and I'm most comfortable when I can draw upon first hand experience, but some things, as here, are out of my experience. Also I have forgotten a lot , and the database is constantly growing and changing, so I lean ever more heavily on the literature available. In this case I went first to an old standby: Handbook of North American Birds. Volumes 4 & 5 cover raptors and the info above is cited on p. 1 of the Gyrfalcon chapter (vol 5). But like me this is old material, so I also like to check in with the Cornell Labratory of Orthnithology, which I use as my primary reference for current data. The formula under discussion is also cited there. (Cornell/AOU is a subscription service...about $35 or $40 for one year, IIRC). I access it at https://bna.birds.cornell.edu/bna.

As for bill, cere, & foot coloration: Both falcons show considerable variation by geography, overall color group, and age. The literature is not providing me an easy way to distinguish all individuals using only these characteristics, and I lack the field experience to make an informed statement pro or con. That's why I offered the feather length formula: reading it in flight is more challenging than having a bird in hand, but there is no mention of variabilty across species.



Feb 07, 2013 at 04:36 PM
UgashikBob
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p.1 #19 · p.1 #19 · Peregrin Falcon/Gyrfalcon?


OR:
Excellent info and sources. We live on the border of the Alaska Peninsula Wildlife Refuge and I have been in touch with one of there people to help ID this bird and they agree with you. Been a real educational experience for me. Thank you for your help
Bob



Feb 07, 2013 at 06:47 PM





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