Study the Least Sandpipers in the first three photographs, then find the Western Sandpipers in the fourth photograph.
The Western Sandpipers have grayer backs and black legs (rather than the browner backs and yellow legs of the Least Sandpipers). The Westerns are also slightly larger and have longer bills.
There are at least four Western Sandpipers in the center of the image (two with bills pointing left, one with bill pointing slightly right, the other sitting with its bill tucked under its feathers).
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