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The sooty tern, scientifically named *Onychoprion fuscatus*, is a species of bird within the family Laridae. It belongs to the order Charadriiformes, class Aves, and phylum Chordata. The species was described by Linnaeus in 1766 and is classified under the genus *Onychoprion*. Its common name is also recorded in other languages, including Rußseeschwalbe, Charrán sombrío, and xatrac fosc.

This marine bird has a wingspan of 90. Its range includes Brazil, Indonesia, South America, and Africa. The International Union for Conservation of Nature assessed its conservation status as Least Concern in 2020. The World Register of Marine Species lists the taxon as accepted.