Fig. 13-52. All birds resemble one another anatomically, differing only in minor details. Their body parts are 

 adapted to fulfill certain functions that are associated with their particular mode of life. For example, the beak 

 in these four birds is modified for food-getting. Both the eagle (top right) and the owl (top left) are predators, 

 usually feeding on small mammals. The beak is well suited for tearing prey. The woodpecker (bottom left) has a 

 sturdy beak used for drilling holes in tree trunks in search of insect larvae, which it feeds upon. The young duck 

 (bottom right) has a beak adapted for straining the water and retaining the small plant and animal life that 

 forms its food. 



