Black duck 



Flamingo 



Great blue heron 



w 





Bald eagle 





Paroquet 





%."~' 



American crossbill \: • ... '.i 



Fig. 189. Specialization in the beaks of birds 



A beak is a beak, but the bill of a sparrow is different from that of a stork. Many of 



the distinctive features found in the beaks of different species of birds correspond to 



specialized ways of getting food or to the character of the food eaten 



