GULLS AND TERNS. 59 



called in the fens, belongs to the group known as 

 Marsh Terns birds that rarely frequent the sea 

 coast at all, so that its absence from our avi-fauna, 

 although greatly to be deplored, could scarcely 

 be remarked by the observer of marine species 

 alone. The White-winged Black Tern and the 

 Whiskered Tern complete this division, known as 

 " Marsh Terns." Both these latter are occasional 

 wanderers to the British Islands. 



