Key to the Rodentia
           
 
 Tail with most hairs erupting to the sides, making it appear flattened; gliding membrane extending from wrist to ankle; fur silky, grayish above, white below; interorbital region relatively narrow, with an obvious U- to V-shaped notch (Fig. 31a)
   
 Tail round and bushy, no gliding membrane; if gray above and white below, then fur not silky; interorbital region relatively wide and lacking the U- or V-shaped notch
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names