Also known as Erolia mauri - is part of a very large group of small migratory shorebirds known in America as "peeps" and in the UK as "stints.".    From Wordnik.com.  [The Guardian World News] Reference

Mystery Bird: Western sandpiper, Calidris (Erolia) mauri.    From Wordnik.com.  [The Guardian World News] Reference

Mystery Bird: Western sandpiper, Calidris (Erolia) mauri | GrrlScientist.    From Wordnik.com.  [The Guardian World News] Reference

Leucistic (nearly totally white) western sandpiper, Calidris (Erolia) mauri.    From Wordnik.com.  [The Guardian World News] Reference