GREAT SKUA. 341 



ICELAND GULL. 



LARUS LEUCOPTERUS. 



Genus LARUS. 

 Lesser White-winged Gull. 



Another winter visitor, less regular in its visits than 

 the last. 



IVORY GULL. 



LARUS EBURNEUS. 

 Genus LARUS. 



Snow-bird. 

 An accidental straggler of rare occurrence. 



GREAT SKUA. 



STERCORARIUS CATARRHACTES. 



Genus STERCORARIUS. 

 Common Skua Brown Gull. 



An accidental visitor to the British Isles during 

 autumn and winter, but breeds in the Shetlands. 

 This bird is very bold and fierce, and will attack any 

 birds of prey which may visit its breeding haunts. 

 It feeds upon fish and carrion ; most of the former it 

 obtains by chasing and bullying the Gulls and com- 

 pelling them to disgorge their prey. In spite of its 

 fierceness, however, this bird seems to become per- 

 fectly tame in confinement. The nest is composed 

 chiefly of moss, and the eggs, generally two in number, 

 vary from light to dark brown, spotted and blotched 

 with dark brown and greyish brown. 



