This species was first described by Linnaeus in his Systema naturae in 1758 under its current scientific name.[3] There are three subspecies: A. b. bahamensis in the Caribbean, and a vagrant in south Florida. A. b. galapagensis on the Galapagos, and the slightly larger A. b. rubirostris in South America. The latter race may be partially migratory, breeding in Argentina and wintering further north.[2]
This species occurs on waters with a degree of salinity, such as brackish lakes, estuaries and mangrove swamps.[2]
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