This is an adult in full breeding plumage. This species is endemic to the Pacific Ocean migrating from the Arctic along both coasts to South America, Asia and Australia as well as the South Pacific Islands. In California it is a fairly common migrant along rocky shores, but scarce in winter. In Asia it is usually less common than the very similar Gray-tailed Tattler (T. brevipes). Older field guides placed the tattlers in the genus Heteroscelus, but the AOU merged them into Tringa in the 47th Supplement. Digiscoped with Panasonic Lumx LX5 | Nikon Fieldscope III | 30X hand-held no adapter.
References:
Gill, Robert E., Brian J. McCaffery and Pavel S. Tomkovich. (2002). Wandering Tattler (Tringa incana), 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/wantat1
Chandler, R. (2009). Shorebirds of North America, Europe, and Asia: A photographic guide. Princeton.
Van Gils, J., Wiersma, P. & Kirwan, G.M. (2019). Wandering Tattler (Tringa incana). 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 https://www.hbw.com/node/53915 on 16 August 2019).