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Pectoral Sandpiper vs Semipalmated Sandpiper

Calidris melanotos versus Calidris pusilla

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Pectoral Sandpiper (Calidris melanotos) Pectoral Sandpiper
Semipalmated Sandpiper (Calidris pusilla) Semipalmated Sandpiper

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Pectoral Sandpiper · Semipalmated Sandpiper · My Tricky Birds