Key to the Rodentia
           
 
 Mouse-sized; length of skull less than 20 mm; incisors notched (when viewed form the side) (Fig. 48a)
   
 Rat-sized; length of skull more than 20 mm; incisors not notched (Fig. 48b)
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names