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Western Sandpiper vs Semipalmated Sandpiper

Calidris mauri versus Calidris pusilla

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Western Sandpiper (Calidris mauri) Western Sandpiper
Semipalmated Sandpiper (Calidris pusilla) Semipalmated Sandpiper

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Western Sandpiper · Semipalmated Sandpiper · My Tricky Birds