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Least Sandpiper vs Semipalmated Sandpiper

Calidris minutilla versus Calidris pusilla

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Least Sandpiper (Calidris minutilla) Least Sandpiper
Semipalmated Sandpiper (Calidris pusilla) Semipalmated Sandpiper

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Least Sandpiper · Semipalmated Sandpiper · My Tricky Birds