- Onychoprion anaethetus
- Brownish-grey upperparts
- Narrow white forehead patch, extending behind eye
- Black loral stripe
- May show pale collar
- White underparts
- Black legs and bill
- Deeply forked tail
- Scaly grey upperparts
- Pale underparts
Mexico, the Caribbean and west Africa; other races occur around Arabia and in Southeast Asia and Australasia.
Scarce vagrant to British Isles, usually during the summer.
Sooty Tern, Bridled Tern, Gray-backed Tern and Aleutian Tern are each others closest relatives and all four are sometimes included in the genus Sterna.
There are 6 subspecies:
Oceans; breeds on rocky islands.
The single egg is laid in a ground scrape or hole.
The diet includes fish which is obtained by plunge-diving.
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, B.L. Sullivan, C. L. Wood, and D. Roberson. 2012. The eBird/Clements Checklist of Birds of the World. 6th ed., with updates to October 2012. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist/downloadable-clements-checklist
- Collins Bird Guide ISBN 0 00 219728
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