60 



THE BIRDS OP AUSTKALIA 



ones, as well as with the dark birds. They breed on the high 

 parts of the Island as well as the low parts. Though tested in 

 every manner that could be thought of, nothing that could be 

 used as a separating test could be found." These petrels build 

 their nests on the surface, and do not lay in burrows. 

 Mr. Iredale states in the same article that "The manner of 

 making these nests is identical, the site is chosen apparently 

 without reference to its nest-building suitability. The bird sits 

 on its nest and picks up all the straws it fancies, and gravely 



Toy. "Erebus*' and "Terror." 

 The Cook Petrel: Oestrelata cooki. 



throws them behind it, first on one side, then on the other. 

 Having selected all suitable, it moves forward, repeating the 

 process and straying as far as a yard from its nesting-place." 



The White-winged Petrel. 



CEstrelata leucoptera. 



Australian seas. 



Upper surface dark slaty-blaek, centre of back and tail coverts dark 

 grey; face and under surface white; forehead and sides of neck spotted 

 with slaty-black. Total length about 12 inches, wing 8..5 tail central 

 3.8, lateral 3.1, bill 1.35, tarsus 1.2. ' ' 



