736 



EVOLUTION OF ANIMALS 



Part V 



Insect trop 

 Night Hawk 



Grips slippery fishes 

 Merganser Duck 



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Chisels for insects 

 Woodpecker 



Spears frogs, fishes 

 American Bittern 



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Scoops fishes into its pouch 

 Brown Pelican 



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Tears flesh with a hook 

 Hawk 



Probes for worms with flexible bill thot 



can be moved without opening the jaw 



Woodcock 





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Bristles help to catch small insects 

 Phoebe 



Fig. 36.7. Beaks of birds that feed upon animals, insects to small mammals; the 

 structures are more specialized and striking than those of plant feeders. 



seeds in winter, the only food on which they can live through the winters of 

 temperate and northern climates. Owls, hawks, and other predators live on 

 small animals the year round. 



Types of Feet. No birds have more than four toes, commonly arranged 

 with three in front and one corresponding to our great toe pointed backward. 

 From this oldest pattern, feet vary with the habits of the birds and the toes 

 may be four, three or two. From hummingbirds to ostriches the legs and feet 



