White-winged Tern

The white-winged tern is a small tern of fresh water. In summer the adult has short red legs and a short, stubby black bill, a black head, neck and belly, a very dark grey back and a white rump with a pale, almost white tail. The wings, as the name implies, are mainly white, with a greyish inner wing and brown-tipped coverts. In non-breeding plumage most of the black is replaced by white or pale grey, though a few blackish feathers may remain. (Wikipedia, general species account)

Its breeding habitat is freshwater marshes from southeast Europe across Central Asia to the Russian Far East. It nests either on floating vegetation in a marsh or on the ground very close to water, in a nest of small reed stems and other plants, laying two to four eggs. In winter it migrates to Africa, southern Asia and Australia. It is a scarce vagrant in North America and has also been recorded in South America. (Wikipedia, general species account)