37° 



PRACTICAL ZOOLOGY 



Fig. 251. — Three young chimney swifts in their nest. (Photo, by Hegner.) 



The falcons, hawks, eagles, and kites vary in size from the 

 little sparrow hawk to the large bald eagle, our national bird 

 (Fig. 244). Some of them are injurious because they rob the 

 henyard and destroy other birds, but most of them are decidedly 



Fig. 252. 



Nests of a colony of cliff swallows built on the side of a cliff near 

 a river. (Photo, by Hegner.) 



