Key to the Rodentia
           
 
 Color grizzled brown; tail slightly shorter than head and body; braincase box-like with nearly vertical sides and flat top; temporal ridges prominent
(Fig. 49a)
   
 Color grizzled brown or black; tail considerably longer than head and body; braincase more rounded and without prominent temporal ridges (Fig. 49b)
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names