Key to the Rodentia
           
 
 Tail usually equal to (may be slightly longer than) head and body length; back and sides uniform in color; tail with an indistinct grayish dorsal tail stripe; rostrum comparatively shorter and broader
   
 Tail usually equal to and often slightly shorter than head and body length; back and sides contrast in color, back darker than sides; tail with a distinct narrow blackish dorsal tail stripe; rostrum comparatively longer and narrower
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names