38 



Nighthawks fly most at dusk or on cloudy days, frequent- 

 ing open localities or cities ; thousands see them every day 

 during the season they are with us. Whip-poor-wills are 

 night birds, frequenting woods and are seen by but compar- 

 atively few persons. The call of the Nighthawk is a rasp- 



Fig. 33. The male spend daytime sitting lengthwise along 

 limbs and is quite difficult to see. 



ing, nasal "peenk," given while flying; that of the Whip- 

 poor-will is a loudly and rapidly whistled "whip-poor-will" 

 often repeated twenty or more times in succession; this 

 song is uttered while perched in the tops of trees. 



The dilferences between the two birds are so great that 

 there is really little reason for confusion, whenever or 

 wherever they are seen or heard. . . 



Nighthawks are past masters in the art of aviation. There 

 are no feats of skill performed by other birds that cannot 

 be equalled by these. During June and July they can 



