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Alternative name - White-winged Black Tern
A small marsh tern, 23-27 cm long, 58-67 cm wingspan, 42-79 g weight.
In non-breeding plumage, most of the black is replaced by white or pale grey; head with white forehead, black-brown crown, flecked with white, and the hindcrown is blackish with a certain amount of white flecking, broad and white collar; bill becomes black.
In juveniles and moulting adults, the rump is pale grey, becoming grey in both phases late in the year. The clear white collar and rump isolate the mantle as a dark brown 'saddle'. The mantle feathers have narrow paler brown tips, as have the tertials and scapulars.
 Similar species
Black Tern is easily distinguished in breeding plumage by its dark grey wings and black bill.
Juvenile and winter birds are more difficult, with the black half-collar and grey rump of Black Tern picking it out from the white neck and rump of White-winged Tern.
Whiskered Tern is also a potential confusion species in winter plumage, best distinguished by its head pattern (white crown and dark mark through its eye, more like a miniature Gull-billed Tern) and pale grey rump.
Breeds in well-vegetated wetlands in southern and eastern Europe (eastwards from the Po Valley in Italy and Poland eastwards across central Asia to southeasternmost Russia. The largest populations are on the steppes of Kazakhstan and southern Russia.
Winters also on freshwater (unlike Black Tern, which mainly winters at sea), throughout sub-saharan Africa, across southern Asia and northern and eastern Australia; small numbers reach New Zealand, where it has also bred once.
In or near bodies of fresh water and freshwater marshes.
They build a nest of small reed stems and other vegetation, placed either on floating vegetation in a marsh or on the ground very close to water. Two to four eggs are laid.
The diet mainly comprises insects and crustaceans, and to a lesser extent small fish.
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