Key to the Rodentia
           
 
 Tail 65 mm or less, sharply bicolored; skull usually less than 22 mm in length
   
 Tail more than 65 mm in length; not sharply bicolored; skull usually more than 22 mm
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names