Monday, July 2, 2012

Quiz #456 (2012-3-01) Solution

Click on picture(s) for a larger view.

Solution by Tony Leukering and Sean Walters

All eight of this week's quiz birds are of very similar size and shape, so they must be of the same species or of incredibly similar species if there are multiple species present. Of course, since these are shorebirds, we know that there are certainly sets of very similar species, particularly in the small Calidris sandpipers (Semipalmated/Western/Red-necked/Little and White-rumped/Baird's). We could spend hours studying the picture and I could spend hours discoursing on why this species or that species is not included in this picture, but I think that I will take Sean Walters' tack to the correct answer. Sean wrote

"... only one Calidris species has a completely gray underwing. All of the birds have completely gray underwings, so they are all of the same species."

Good for you, Sean, particularly as that was the very reason that I used this photo, as all similar species have extensive amounts of white on the underwing. All eight birds are showing, to greater or lesser extent, their underwings, making the ID straightforward. I took this picture of Red Knots on 26 September 2011 at Stone Harbor Point, Cape May Co., NJ. Note: multiple respondents provided answers including more than one species, hence the disconnect between numbers of respondents and numbers of answers.

Incorrect species provided as answers:
White-rumped Sandpiper - 4
Western Sandpiper - 1
Baird's Sandpiper - 2
Semipalmated Sandpiper - 2
Sanderling - 1
Pectoral Sandpiper - 1

Congratulations to the 13 of 19 getting the quiz correct:
Al Guarente
Margaret Smith
Kirk Huffstater
Ben Coulter
Richard Jeffers
Margie Joy
Logan Kahle
Sean Walters
Su Snyder
Pam Myers
Peter Wilkinson
Josh Yoder
Bryan Guarente

Answer: Red Knot