E 



B 



D 



H 



Fig. 154. — Representative birds of the class Aves (not to scale). A. Mourning 

 dove {Zenaidura macroura carolinensis) ; B, common tern (Sterna hirundo) ; 

 C, green heron [Butorides virescens virescens) ; D, ring-neck duck (Marila col- 

 laris) ; E, brown pelican (Pelicanus occidentalis) ; F, great horned owl (Bubo 

 virginianus virginianus) ; G, cardinal {Cardinalis cardinalis) ; H, cedar waxwing 

 (Bombycilla cedrorum). (Copyright by General Biological Supply House, Inc., 

 Chicago. ) 



