A crow is a large black bird native to Earth, similar in appearance to a raven.
Vedek Bareil Antos once described a Bajoran monk who he knew as a child as a "stern old crow". (DS9: "In the Hands of the Prophets")
When reading Seven of Nine's logs to discover why she left Voyager abruptly in 2374, Captain Janeway came across a passage: "The feathers are black... wingspan approximately one and a half meters... the eyes are yellow...", and believed she was describing a member of the Corvidae family, like a raven or a crow. (VOY: "The Raven")