206 



VERTEBRATA : AVES OR BIRDS. 



FIG. 241. 



Sooty Albatross, Diomedea fuliginosa, Gmelin. 



FIG. 242. 



islands of the Pacific, and are the largest of swimming 



birds, being bulky, and hav- 

 ing a length of forty inches 

 or more. 



The Petrels are at once 

 distinguished by their nos- 

 trils, which are in the form 

 of a double tube placed on 

 the top of the bill at its 

 base. Petrels vary in size, 

 from the little Stormy Pet- 



Petrel, Thallassadroma Leachii, Temmuick. ,--, i i 



rels or " Mother Carey s 



chickens," which are only about six inches long the 

 smallest of swimming birds to the gigantic Fulmars, 

 which are about as large as the Albatrosses. 



