184 CATALOGUE OF BIRDS. 



This is by no means an uncommon occurrence, 

 still this interesting Gull receives the benefit of 

 the act for the preservation of sea birds. 



The specimens in the immature stages, shewing 

 the third or fourth, and also the second, years' 

 plumages were shot in the Highlands, in 1877. 



MANX SHEAEWATEE. 

 Case 236. 



I have frequently met with this bird during autumn in 

 the North Sea, its curious flight always drawing atten- 

 tion, at whatever distance it might be seen. 



The specimens in the case were shot in the Firth of 

 Forth, August, 1874. 



GEEAT BLACK-BACKED GULL. (WINTER.) 

 Case 237. 



During winter the snow white head and neck of the 

 mature bird becomes slightly marked with grey, and 

 the bright colours on the beak are less intense. 



The specimen in the case was captured in a vermin 

 trap, baited with a dead Pochard, that I liad set for 

 the benefit of the Grey Crows that came in flocks to 

 consume the food of some Decoy Ducks I was keeping 

 on Hickling Broad, in the winter of 1872. 



COMMON GULL. (SUMMER.) 

 Case 238. 



Although it is stated as a fact in several ornithological 

 works that this Gull nests in the cliffs on the sea- 



