- 9.1–10.2 in
- 22.4–23.6 in
- 1.8–2.1 oz
- Guifette noire (French)
- Gaviotin negro, Charrán negro, Fumarel negro (Spanish)
- The Black Tern is very social. It breeds in loose colonies and usually forages, roosts,and migrates in flocks of a few to more than 100 birds, occasionally up to tens of thousands.
Populations declining, especially at southern edge of range.
- Dunn, E. H., and D. J. Agro. 1995. Black Tern (Chlidonias niger). In The Birds of North America, No. 147 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, and The American Ornithologists' Union, Washington, D.C.