214 
ZOOLOGY. 
wing, far out at sea following in the wake of vessels for 
food, and breed in holes in the ground. The terns are 
known by their very long, stout beaks. They lay from 
one to three eggs in a hollow in the ground. They are 
noisy, with shrill voices, and, like gulls, are gregarious. 
The common tern or sea-swallow {Sterna Mritndo) has a 
red bill, while the roseate tern {S. paradiscea, Fig. 251) has 
Fig. 252.—^, Kittiwake Gull; J5, Ivory Gull. From Nordenskiold. 
a black bill, and the body is rosy beneath. The gull family 
have larger bodies and feet, and the wings shorter than in 
terns. They occur on all sea-coasts and inland lakes (Fig. 
252). The skuas (Fig. 253) have habits like those of gulls. 
The most notable member of the group of petrels is the 
albatross {Dmnedea exidans) of the Southern hemisphere. 
Its wings expand more than three metres (nearly ten feet). 
It lays a single egg 12 cm. long, and spends most of its life 
