Wood Sandpiper

The wood sandpiper is the smallest of the shanks, a group of mid-sized, long-legged waders that largely use freshwater and wetlands. It looks like a longer-legged, more delicate green sandpiper, but with a shorter, finer bill, a brown back, longer yellowish legs and a smaller, less contrasting white rump patch. Its closest relatives are the common redshank and the marsh sandpiper, and it has no subspecies (Wikipedia, general species account).