Calidris minutilla (Syn: Erolia)
Sandpiper, Phalaropes (Scolopacidae) Family
The Least Sandpiper is the smallest shorebird. The species has greenish legs and a short thin dark bill. Breeding adults are brown with dark brown streaks on top and white underneath. They have a light line above the eye and a dark crown. In winter, the birds turn grey above. The juveniles are brightly patterned above with rufous coloration and white mantle stripes.
This bird can be difficult to distinguish from other similar tiny shorebirds; these are known collectively as "peeps" or "stints". In particular, Least Sandpiper is very similar to its Asian counterpart, Long-toed Stint. It differs from that species in its more compact, shorter-necked appearance, shorter toes, somewhat duller colors, and stronger wing bar.