The Greater Yellowlegs (Tringa melanoleuca) is a large North Americanshorebird, similar in appearance to the smaller Lesser Yellowlegs. Its closest relative, however, is the Greenshank, together with which and the Spotted Redshank it forms a close-knit group. They are also the largest shanks apart from the Willet, which is altogether more robustly built.Photo credit: Mike Baird