Semipalmated Sandpiper (Calidris pusilla) October 11, 2018 640 × 427 Semipalmated Sandpiper (Calidris pusilla) Semipalmated Sandpipers resting. 2 juveniles on right, adult on left. Late August, Napeague, New York. Shorelines. Migrant. Near-threatened (IUCN).