Performing medical tests on colonies of herring gulls, black-crowned night herons and Caspian terns to see whether pollution is contributing ... and horizontal gene transfer events. The Effects of ...

The largest of the terns, larger than many gulls ... even in late winter, many an adult Caspian is trailed by a begging youngster from the previous nesting season.

Strictly coastal in the southeastern states. Larger than the typical terns of the Forster's / Common sort, but distinctly smaller than Royal or Caspian terns. Might be thought of as the Royal Tern's ...