228 



ANNALS OF BIRD LIFE. 



SPECIES. 



POINTS OF DISTINCTION. 



Pomarine Skua 



Buffon's Skua . 



Little Auk 



White-billed Diver 



Sooty Shearwater 

 Bewick's Swan 



Snow Geese . 



Tail broad and rounded in adults ; 

 centre tail feathers long and 

 twisted (4 inches longer than 

 rest) ; tarsus longer than middle 

 toe and claw. Length 21 

 inches. 



Central tail feathers long and 

 pointed (9 inches longer than 

 rest); first and second primaries 

 only with white shafts; nostrils 

 nearer frontal feathers than tip 

 of bill. Length 22^ inches. 



Resembles Razorbill in general 

 appearance, but very small. 

 White spot over eye ; chin, 

 throat, and fore neck white in 

 winter. Length &*4 inches. 



Similar to Great Northern Diver in 

 colour, but bill stouter, curved 

 upwards, and pale yellow ; six 

 white streaks on front of throat ; 

 ten on sides of neck. Length 

 34 inches. 



Under parts uniform brown. Length 

 1 8 inches. 



Smaller than Hooper ; yellow 

 on base of bill not extending 

 below nostrils. Length 50 

 inches. 



Entire plumage in adults white, 

 except primaries, which are black. 

 Length of wing 15 to 18}^ inches. 

 Bill, legs, and feet red. Young, 

 pale slate gray, darkest on 

 scapulars and wing coverts, which 

 have pale margins. 



