The true crows are large passerine birds that form the genus Corvus in the family Corvidae. Ranging in size from the relatively small pigeon-sized jackdaws to the Common Raven. In the United States, the word "crow" is used to refer to the American Crow. The crow genus makes up a third of the species in the Corvidae family. Other corvids include rooks and jays. A group of crows is called a "murder," though this term usually appears in poetry rather than scientific contexts.
