The fish crow (Corvus ossifragus) is a species of crow associated with wetland habitats in the eastern and south-eastern United States. It was first described by Alexander Wilson in 1812. The fish crow is superficially similar to the American crow, but the latest genetic testing indicates this species is closely related to the Sinaloa crow (Corvus sinaloae) and the Tamaulipas crow (Corvus imparatus), and not as close to the American crow (C. brachyrhynchos) as outward signs would suggest. It is smaller than the American crow and has a silkier, smoother plumage. Fish crows tend to have more slender bills and feet. There may also be a small sharp hook at the end of the upper bill. Fish crows have a bluish-violet or greenish gloss over most of the wings and body that is more extensive than in the American. When calling, fish crows tend to hunch and fluff their throat feathers.