Skin reinforced except on underside by dermal bones (bony plates) (Fig. 4); virtually hairless except on belly; limbs strong and feet heavily clawed; mouth opening very restricted; tongue long and protrusible; teeth consisting of eight simple teeth in the side of each jaw
   
Skin not armored with bone; body covered with hair; limbs various; mouth normally gaping; tongue not exceptionally long and protrusible; teeth differentiated, some occupying front of jaws
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names