I Hummingbird 



Hen Ostrich 



Moa (Extinct) 



Aepyomis 

 (Extinct) 



Fig. 27. Specializations of the Birds. The beak is modified for pecking, 

 tearing, or catching fish. The legs and claws are adapted for correlated func- 

 tions: walking, grasping, or wading. The eggs of different birds (at bottom) 

 show the comparative sizes. 



