32 ELEMENTS OF ORNITHOLOGY. 
distinct form called a Diving Petrel (Pelecanoides urinatri«) is 
found in Kerguelen Land. The largest of the group is the 
Albatross (Diomedea evulans), a great wandering species, the 
largest of all Water Birds. Its home is in the Southern Hemi- 
sphere, but it has been taken in Europe. Its enormously long 
wings and its habit of sailing without flapping them for a 
long period are well known. There are some ten species of 
Albatross. - 
Another wandering oceanic creature is the Frigate-bird 
Fig. 31. 



The Frigate-bird (Tachypetes aquila). 
(Tachypetes aquila), which has in some respects the aspect of a 
bird of prey of the Hawk or Eagle kind, with a powerful hooked 
beak and a long, forked tail. It has, however, marvellously 
long wings and very small feet, and is believed to have the most 
powerful flight to be met with in the class of Birds. It soars to 
great heights. Frigate-birds are great persecutors of others, 
pursuing Terns and Gannets, forcing them to disgorge a fish 
they may have captured, and catching it as it falls. They are 
often called ** Men-of-war Birds.” They range the ocean in all 
