As a group, the crows show remarkable examples of intelligence, and Aesop's fable of The Crow and the Pitcher shows that humans have long viewed the crow as an intelligent animal. Crows and ravens often score very highly on intelligence tests. Certain species top the avian IQ scale. Crows in the northwestern U.S. (a blend of Corvus brachyrhynchos and Corvus caurinus) show modest linguistic capabilities and the ability to relay information over great distances, live in complex, hierarchic societies involving hundreds of individuals with various "occupations", and have an intense rivalry with the area's less socially advanced ravens.
