Greg Gillson has a great post on distinguishing between Greater and Lesser Yellowlegs. His primary method is to simply compare the length of the bird's bill to the length of its head. If the bill is longer than the head, it is a Greater Yellowlegs. If it is equal or less than the head, it is a Lesser Yellowlegs.Go ahead, give it a try. Measure this birds bill and you will see that it is shorter than its head. Then do the same with my posting of the Greater Yellowlegs and you will see that its bill is longer than its head.
Its a good method as even though the Lesser is noticeably smaller than a Greater, if they aren't side-by-side that method fails.
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