GENERAL CHARACTERS OF BIRDS 



731 



outside the ureters, and open into the middle region of the 

 cloaca. The right ovary atrophies y the right oviduct is rudi- 



mn 



fhW 



Fig. 432. — A falcon. 



mn.. Mandible ; C, cere ; N., nostril ; E.C., ear covert ; tJi.W., 

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

 aries; P., primaries; R., rectrices ; A., ankle; Mt., tarso- 

 metatarsus ; /., first toe. 



mentary. There is rarely any copulatory organ, hut it is 

 large in ostriches, ducks, geese, and some other birds. 



