BRITISH BIRDS' NESTS. 



329 



latter period will sometimes feed the chicks of a 

 different species altogether when he has satisfied the 

 appetite of his mate. 



ROBIN. 



ROOK. 



( Corvus frugilegus.} 

 Order PASSERES ; Family CORVID.E (CROWS). 



Description of Parent Birds. 

 Length from eighteen to twenty- 

 one inches. Beak large, strong, 

 arched towards the point, and 

 black. Round the base of the 

 bill in the adult bird the skin is 

 bare, rough, and light grey. 

 This feature readily distinguishes 

 it from the Carrion Crow. Irides 

 dark brown. The whole of the 

 plumage is black, glossed with 



rich purple on the upper-parts. Legs, toes, and 



claws black. 



YOUNG ROOK. 



