Key to the Rodentia
           
 
 Dorsal color clear gray, breast and belly gray with whitish tips; ventrally white with base of belly hair gray; nasal septum imperforate
   
 Dorsal color not clear gray, ventrally white with gray belly or throat hair; hairs olivaceous, gray, or buffy above, white or gray below; septum between anterior palatine foramina perforate
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names