Key to the Rodentia
           
 
 Back, sides, and tail covered with coarse black and yellow hair and quills, weight 4.5-9 kg; infraorbital foramen larger than foramen magnum; incisors not grooved
   
 Body covered with fur, hair, or bristles but no quills, weight 4.5 kg or less, usually much less; infraorbital canal not as large as foramen magnum; if larger, then incisors grooved
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names