Life History
This species breeds in colonies on lakes, marshes and coasts. It nests in a ground scrape and lays two to five eggs. While widely distributed in freshwater areas in Eurasia, it is associated almost solely with saltwater, coastal areas in North America.
This is a somewhat atypical tern, in appearance like a Sterna tern, but with feeding habits more like the Chlidonias marsh terns, Black Tern and White-winged Tern. It used to be grouped in the genus Sterna but is now placed on its own in the genus Gelochelidon.
The Gull-billed Tern does not normally plunge dive for fish like the other white terns, and has a broader diet than most other terns. It largely feeds on insects taken in flight, and also often hunts over wet fields and even in brushy areas, to take amphibians and small mammals, as well as small birds and the chicks and eggs of other terns.
Read more about this topic: Gull-billed Tern
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