AVES. 



FIG. 218. 



417 



FIG. 2i'8. 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 

 adnlt. What are the points of difference? Of manifest likeness? 



of the rock-pigeon (Columba livia] of southern Europe. The 

 differences in form and structure between the different artifi- 

 cial varieties of pigeon are much greater than are found sep- 

 arating many natural species or even genera. 



The order Raptores includes the birds of prey, as the eagles, 

 vultures, hawks, owls. They are characterized by hooked 

 beak, strong, curved claws, and great powers of flight. The 

 28 



