Sexes alike. Grey-brown above, closely spotted with white; slender build; white rump and tail; white below; brown on breast; no wing bar. Summer: dark olivebrown above, spotted white. The Green Sandpiper T. ochropus is stouter, more shy, much darker and glossy brown-olive above; in flight, white rump contrasts strikingly with dark upper body; blackish below wings diagnostic. Small to medium-size flocks, often with other waders; quite active, probing deep into mud or feeding at edge.