Gull-billed tern Sterna nilotica

Identification Tips:

Adult alternate:

Adult basic:


Similar species:

The Gull-billed Tern can be identified in all plumages by its thick, relatively short, black bill and shallowly forked tail.

Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.