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Date: Sat, 25 Oct 2003 22:14:53 -0700
To: Les Chibana <[[email protected]]>,
   South Bay Birders <[[email protected]]>,
   San Mateo birds list <[[email protected]]>
From: Alvaro Jaramillo <[[email protected]]>
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Subject: [SBB] Re: [pen-bird] Bayside birding 10/25/03
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>
>
>BTW, I am very aware of the problem of IDing non-vocal dowitchers,
>and I do teach my students to be conservative with these species.
>I am fairly sure that the very short-billed dowitchers at the shell
>beach
>at Foster City are Short-billed Dowitchers at the short end of the bill
>length scale. When I photographed these birds a few years ago, I did
>hear them emit the proper flight calls. Go see for yourself, you should
>find them very interesting.

Les,

    Many shorebirds that have a wide latitudinal wintering range tend to 
separate out by sex. Since we are at the northern wintering range for 
Short-billed Dowitcher I would not be surprised if the ones we get in 
winter at Foster City are all (or mostly) males. This would account for 
your short bill sizes, and would suggest that the sexes separate out in 
winter. I don't know if the Birds of North America account deals with this 
topic. In any sexes separating out by latitude is a relatively common 
phenomenon in shorebirds.

cheers

Al

Alvaro Jaramillo
Biologist
San Francisco Bay Bird Observatory
P.O. Box 247
Alviso, CA 95002
(408)-946-6548
http://www.sfbbo.org/
[[email protected]]

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