48 



PETRELS, SHEARWATERS, ETC. 



feet are yellowish. The primaries and tail 

 are black and there is a line of white crossing 

 the upper tail coverts, fig, 33. 



It is very light and easy in flight, turn- 

 ing from side to side with so little effort that 

 it appears to float gracefully in air. Breeds 

 in the Southern Hemisphere, but is very 

 common off our coast from May until Decem- 

 ber. 



Fig. 34. 



Cory Shearwater. 1-2. 



