BRITISH BIRDS. 



77 



and breed in the rocky cliffs on the sea coast. 

 There, and in more northern parts of the world, 

 they continue the whole year, and subsist on sea- 

 worms, shell-fish, and other marine productions. 

 With us they are seen to mix with, and to feed 

 in the same manner as the Rook. During the 

 breeding season they live in pairs, lay six eggs, 

 seldom more than two or three of which are prolific. 

 They are much attached to their offspring. 



