Key to the Rodentia
           
 
 Yellowish white spot (postauricular patch) behind each ear (Fig. 43); total length usually less than 120 mm; length of skull usually less than 21 mm
   
 No yellowish white spot (postauricular patch) behind each ear; total length usually more than 120 mm; length of skull more than 21 mm
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names