Seen yesterday at Loess Bluffs in NW Missouri. Although it hung out with an Avocet (shown for scale), a pair of Dowitchers, and the ever-present Killdeer, I didn't see any others like it there. Shot under overcast skies, so the colors may be a bit off. Also heavily cr opped. I'm leaning towards Greater Yellowlegs B/C of the bill length to head ratio.