Dunlin (non-breeding plumage)
Calidris alpina

f14 @ 1/1250s, ISO:1600, Nikon D3S w 500mm and 1.7X tele-extender

"Dunlin," Wikipedia, the free encyclopedia.The winter Dunlin is basically grey above and white below. Juveniles are brown above with two whitish "V" shapes on the back. They usually have black marks on the flanks or belly and show a strong white wingbar in flight.
Black Beach, West Falmouth, Massachusetts