Key to the Rodentia
           
 
 Fur soft and silky, without longer guard hairs, auburn to reddish color in adults, smoky gray in juveniles; interorbital width relatively broad, often 4.5 mm or more; braincase as seen from rear wider than high
   
 Fur coarser, dark brownish gray with some fulvous-tipped hairs, longer guard hairs present, belly hairs with tawny tips; juveniles much like adults; interorbital width narrow, usually less than 4 mm; braincase as seen from rear as high as wide
 
           
Artiodactyla
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Carnivora
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Chiroptera
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Didelphimorphia
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Insectivora
 - 
Lagomorpha
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Rodentia
 - 
Xenarthra
Scientific Names - Common Names