Key to the Rodentia
           
 
 Hind foot larger, more than 24 mm; cusps and lophs of upper and lower molar teeth alike
   
 Hind foot smaller, 23 mm or less; cusps of upper and lower molar teeth different, uppers more complex
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names