The New Student's Reference Work/Rook
Rook, an Old-World bird belonging to the crow family. It is slightly smaller than the common crow. Its plumage is purplish black, with gray on the forehead and throat. The adults lose the feathers on the face, leaving a bare spot about the bill. These birds live in noisy flocks and nest near habitations. They are common in many parts of Europe and Asm, and in late autumn migrate to the east shore of Great Britain and return in the spring.