We can ID this shorebird as a Grey-tailed Tattler by its unpatterned greyish upperparts, breast, face and neck; whitish underparts; long, straight, black bill; white eyebrow; and yellow legs and feet. The barred flanks indicate this bird is starting to molt into breeding plumage. When it fully molts into breeding plumage the entire underparts will be barred.
The Grey-tailed Tattler is a new species to our Photographic Life List, which now stands at 681.