White-winged Terns, with their contrasting black-and-white plumage, breed in freshwater marshes in southeast Europe to central Asia.
In winter, they migrate to Africa, southern Asia and Australia.
They usually nest either on floating vegetation in a marsh or on the ground very close to water.
Like the other "marsh" terns (Chlidonias sp., like the Whiskered Tern and Black Tern), and unlike the "white" terns (Sterna sp., like Common Tern, Caspian Tern, Arctic Tern), these birds do not dive for fish, but fly slowly over the water to surface-pick items and catch insects in flight.
They mainly eat insects and small fish.

Hortobágy-Halastó, Hortobágy National Park, Hungary, 2 May 2019