The Black-bellied Plover is Washington’s largest plover. The breeding adult male is solid black from chin to belly. The upperparts are white or white mottled with black. The female is more brownish than black. Juveniles and birds in non-breeding plumage are speckled gray-brown above with a gray-brown breast and white belly. A white rump is visible in all plumages. The breast and sides are heavily streaked in the juvenile. In flight, black axillaries contrast with white under-wing coverts.