Black-winged Tern (Chlidonias leucopterus)

Common winter migrant to marshes, lagoons, paddy fields, tanks and salt-pans of dry lowlands. Rare in wet lowlands. It keeps singly or in small to large flocks often in association with Whiskered Terns to which it closely resemble and difficult to distinguished in non-breeding plumage though former is slightly smaller that latter. In breeding plumage Black-winged Tern become black head, body and under wing-coverts (Picture – spring moult).