56 



PETRELS, SHEARWATERS, ETC. 



on our coast from Maine northward in June, 

 nesting usually in burrows which it digs for 

 itself in the peaty soil of islands, or occasion- 

 ally on the face of earthy or sandy cliffs like 

 Bank Swallows. Common from June until 

 October. Winters south of our limits. 



Fig. 37. 



Leach Petrel. 1-3. 



31. WILSON PETREL. 



A little smaller than Leach Petrel, but 

 looks much darker as it is without the light 



