Identification: Medium-sized sandpiper with long, downcurved bill. In non-breeding plumage, shows clear contrasting white supercilium (unlike Dunlin, which has a weak or indistinct supercilium). See Broad-billed Sandpiper for differences. In breeding plumage, head, neck, and underparts mostly rufous; upperparts washed with gray and rufous tones. Birds in early migratory season (July-August) often display patches of rufous on breast and upper belly.