GULLS 



123 



the shoulder of a hill so as to be out of view, and 

 resumes his quest at the point at which he origin- 

 ally started." 



The angler fishes occasionally, the gull per- 

 sists daily in these manoeuvres from dawn to 

 dusk until the trout have been cleared out of the 

 stream. 



What is the good achieved by gulls to 

 counter-balance the damage they do to fish? 



The larger and mainly fish-feeding gulls, as 

 already described, do not enter into this con- 

 sideration, for they feed very little upon the 

 land. The herring, common and black-headed 

 gulls, however, take a considerable amount of 

 land food, and below is a table on the land feed- 

 ing habits of 82 herring, 92 common, and 167 

 black-headed gulls compiled at the same time as 

 the table on page 119. 



