GrrlScientist is an evolutionary biologist, ornithologist, aviculturist, birder and freelance science and nature writer. A native of the Pacific Northwest, she relocated from Seattle to NYC with her parrots after earning a BS in Microbiology (emphasis in Virology) and PhD in Zoology (Ornithology) from the University of Washington. In NYC, she was the Chapman Postdoctoral Fellow at the American Museum of Natural History for two years, pursuing part of her "dream" research project by reconstructing a molecular phylogeny of the parrots of the South Pacific islands. GrrlScientist has written a blog about science since 4 August 2004 (the early years are archived 
tags: American Avocet chick, Recurvirostra americana, birds, mystery bird, bird ID quiz
[Mystery bird] American Avocet chick, Recurvirostra americana, photographed in Arizona. [I will identify this bird for you tomorrow]
Image: Richard Ditch, 2007 [larger view].
Date Time Original: 2007:06:01 18:52:32
Exposure Time: 1/159
F-Number: 7.10
ISO: 200
Please name at least one field mark that supports your identification.
Rick Wright, Managing Director of WINGS Birding Tours Worldwide, writes:
This bird's downy plumage may not identify it to species, but it leaves no doubt that we are dealing with a very young bird -- a chick, in fact. The long legs and bill, and the fact that it is standing in water, tells us that this is a shorebird.
Adult shorebirds are best identified by shape and structure, and the same goes for their young. The legs and feet of this bird are long and noticeably stout, with a thick ankle joint. The bill is very strange: relatively massive at the base, then tapering quickly to a fine and ever so slightly upturned tip. That last character puts us onto the correct identification, one that a quick examination of the bird's plumage confirms.
Note the three dark "stripes" on the upperparts; compare that with the wing pattern of a fledged American Avocet. The hint of warm cinnamon on the side of the neck also presages the rusty neck of a juvenile avocet.
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Comments
I'll go with American Avocet chick because of the slightly recurved bill. The dark line behind the eye is just visible as well.
Posted by: Steve Duncan | November 28, 2008 1:06 PM
I'm inclined toward Greater Yellowlegs - curve in bill also applies, and the legs are, well, yellow.
Posted by: Hilary | November 28, 2008 1:15 PM
My guess is a very juvenile American Avocet. I note the pink colour on the neck, the relatively long legs, and the slightly decurved bill. Also, given that it was taken in Arizona, I cannot think of any other wader with the same basic shape in that range.
Posted by: Ian Kinman | November 28, 2008 3:22 PM
I've never seen a Yellowlegs chick but that would be my guess. I'm guessing the leg coloring is important. The fact that the bill is quite stout at the base probably means it has a way to grow. Therefore, I'm going with Hilary and saying Greater Yellowlegs.
Posted by: Paulette | November 28, 2008 4:50 PM
I also vote American Avocet chick, because of the other things mentioned as well as the orange coming in on the neck.
Posted by: Firebyrd | November 28, 2008 4:58 PM
HI ALL:
If you're interested in learning more about identifying chicks of North American birds consult:
A Guide to the Nests, Eggs, and Nestlings of North American Birds (2nd edition) by Paul J. Baicich and Colin J.O. Harrison.
FYI: Greater Yellowlegs DON'T breed in Arizona!
Posted by: Ian "Birdbooker" Paulsen | November 28, 2008 5:13 PM
Clearly this is a newly hatched youngster in Arizona. Both Yellowlegs breed only in northern Canada and Alaska according to Dennis Paulson's shorebird books and the National Geographic Guide, while the Avocet "breeds throughout the west--south throuogh Mexican Plateau". It must be an Avocet!
Posted by: Fran Wood (male) | November 28, 2008 5:16 PM
This is obviously a newly hatched shorebird in Arizona. According to Dennis Paulson's shorebird books and the National Geographic Guide, both Yellowlegs breed in northern Canada and Alaska. The Avocet, on the other hand, "breeds throughout the west--south through the Mexican Plateau". This must be an Avocet!
Posted by: Fran Wood (male) | November 28, 2008 5:25 PM