Gull-billed Tern Overview, All About Birds, Cornell Lab of Ornithology

Unlike most terns, the Gull-billed Tern has a broad diet and does not depend on fish. Instead it commonly feeds on insects, small crabs, and other prey snatched from the ground, air, or even bushes. It is also known to eat small chicks of other tern species.

Although mostly restricted to salt water habitats in North America, the Gull-billed Tern is found in a variety of fresh water habitats across Eurasia.