VI. KEY 



KEY OF THE OEDEES. 



A. With four toes. 

 a. Wings well-developed and used 

 for flight. 



a 1 . Toes free from one another or 

 only partially webbed. 



a 2 . Hind-toe jointed at the 

 same level as the other 

 toes. 



a 3 . Thighs and usually the 

 upper portion of the 

 shanks feathered. 



a 4 . No cere at the base of 



the bill Passeres and Picariae. 



6 4 . A soft fleshy cere at 

 the base of the bill. 



a 5 . Toes zygodactyle, 

 2nd and 3rd for- 

 wardly, 1st and 

 4th backwardly 

 directed Psittaci (Parrots). 



b 5 . Outer or fourth toe 

 reversible at will ; 

 eyes and face more 

 or less forwardly 

 directed Striges (Owls). 



c 5 . Toes normally ar- 

 ranged 2nd, 3rd, 

 4th, forwardly, 1st 

 backwardly di- 

 rected. 



a 6 . Bill and claws 



strong, curved, 



hooked and sharp 



pointed Accipitres (Hawks). 



6 6 . Bill and claws 



weak and straight Columbse (Doves). 



