652 



BIRDS. 



syrinx or song-box (with vocal chords) at the origin of the 







"Ss 



-E.C 



FIG. 357. A falcon. 



., Mandible; C.,cere; N., nostril; E.G., ear covert; th.W^ 

 thumb wing ; C., wing coverts; D. t dorsal coverts; S., second- 

 aries; /\, primaries; R., rectrices ; /4., ankle; Mt., tarso- 

 metatarsus; /., first toe. 



bronchi. Expiration is the more active part of the respiratory 

 process. 



