Incisors 3/3; large canine teeth present (Fig. 6)
   
Incisors 2/1, 1/1, or 0/3; upper canines absent except in elk, lower canines absent, or if present, crowded forward and resembling incisors (incisiform), giving the appearance of four incisors
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names