AVES 421 



of the species are either harmless or actually helpful because 

 they destroy noxious rodents. Cooper's hawk, the sharp- 

 shinned hawk, and the great horned owl are real pests. 



The GallincB (fowls) include quail, partridges, grouse, pheas- 



FlG. 221. 



PIG. 221. Great horned-owl (Bubo virginianus). Young. Photographed from life by Dr. R. W. 



Shufeldt. 



Questions on the figure. Compare the young at all points with the adult. 

 What are the points of difference? Of manifest likeness? 



ants, turkeys, peafowls, and the various kinds of chickens. 

 These birds have a plump, characteristic form. The legs are 

 mostly short or of medium length and armed with short, blunt 

 claws. The beak is stout and bent slightly downward at the 



