White-rumped Sandpiper

Overview

The White-rumped Sandpiper is a slim, long-winged shorebird best known for the solid white band across its rump, visible in flight and a key distinguishing feature from most similarly sized sandpipers, which typically show a dark center to the rump. Upperparts are gray-brown with rufous fringes in breeding plumage, and streaking extends further down the flanks than in many related species. Long wings extend past the tail tip when folded, similar to the Baird's Sandpiper.

It undertakes one of the longest migrations of any shorebird, breeding in the Arctic and wintering in southern South America.

Feather Identification

• Rump: A solid white band spans the entire rump, visible in flight, unlike most similar sandpipers which show a dark center dividing the white rump sides.
• Upperparts (breeding): Gray-brown feathers with rufous fringes on the scapulars, giving a warm-toned mottled back pattern.
• Flanks: Fine streaking extends onto the flanks further than in most other small sandpipers, a useful close-range feature.
• Wings: Long primaries extend past the tail tip on folded wings, similar to the Baird's Sandpiper.
• Compared to similar species: The all-white rump band is the most reliable distinguishing feature from the Baird's Sandpiper and other similarly long-winged peeps, which show a dark-centered rump.

Plumage Notes

Breeding adults show rufous fringing on the upperparts and streaking extending onto the flanks, while non-breeding birds are plainer gray-brown above with reduced streaking below. Sexes look alike. Juveniles show brighter rufous edging on the back feathers, creating a more richly patterned appearance during fall migration compared to plainer adult non-breeding plumage.

Habitat & Range

White-rumped Sandpipers breed on Arctic tundra across northern Canada. They undertake one of the longest migrations of any shorebird, traveling to winter in southern South America, favoring mudflats, marshes, and wet grasslands along the way during their extensive migratory journey through the Americas.

Behavior & Field Notes

This species forages by picking and probing for small invertebrates in mud and shallow water, often mixing with other small sandpiper species during migration. Its flight call is a distinctive thin, high-pitched "jeet," often likened to an insect-like squeak, useful for identification when the bird is flushed or flying overhead. Nesting occurs on the ground on open Arctic tundra, typically well concealed among low vegetation.