LIST OF ILLUSTRATIONS. vii. 



Nest of Kestrel, showing Eggs embedded in remains page 

 of Pellets 267 



Potatoes from Crop of Wood -Pigeon ... ... ... 268 



Attitudes assumed by the Common Gull in Courtship 

 (figs. 1, 2). {Photographed hy Miss Maud D. , 

 Haviland.) — ^Plate 17 facing 277 



Attitudes assumed by the Common Gull in Courtship 



(fig. 3). {Photographed hy Miss Maud D. Haviland) 279 



The Bill and Eyes of Lesser Black-backed Gulls. 

 {Drawn hy E. Alexander and reproduced in 

 colour. )^P\sAjQ 18 ... ... preliminarj^ to 305 



Key to Plate 18 ... ... ... preliminary to 305 



The Bill and Eyes of Great Black-backed Gulls. 

 {Drawn hy E. Alexander and reproduced in 

 colour.) — Plate 19 ... ... ... ... facing 305 



Lesser Black-backed Gull : Juvenile -plumage ... 308 



Lesser Black-backed Gull : First Summer-plumage 309 



Lesser Black-backed Gull: Second Summer-plumage 310 



Lesser Black-backed Gull : Third Winter-plumage 311 



Waxwings at Cambridge. {Photographed hy Miss 



E. L. Turner) 320 



