The heavily streaked breast and black wing patches indicate breeding (Definitive Alternate) plumage. The name "melanoleuca" means "black white." This species prefers inhospitable, mosquito-ridden muskegs for breeding. A long distance migrant, some individuals winter as far south as Tierra del Fuego. Digiscoped with Panasonic DMC-LX5 | Nikon FS 3 | 30XWA | hand-held, no
adapter.
References:
Elphick, Chris S. and T. Lee Tibbitts.(1998).Greater Yellowlegs (Tringa melanoleuca), The Birds of North America (P. G. Rodewald, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/greyel
Van Gils, J., Wiersma, P. & Kirwan, G.M. (2017). Greater Yellowlegs (Tringa melanoleuca). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/53906 on 19 July 2017).