94 



BIRD WORLD. 



Many birds, therefore, have only three, and generally 

 these are all front toes. 



Beside the Swift, who spends so much time in the 

 air, there are two American birds who cannot perch 

 in the usual way; they are Whip-poor-will and the 

 Night Hawk. Their toes are too short to grasp a 

 limb stout enough to hold them, so they rest either 

 on the ground or along, not across, a large limb. 



^^'y-< j.'mZ 



/ / / 



Fig. 20. — Chimney Swift. 



