Key to the Rodentia
		Size large, head and body 250 mm or more; tail long, scaly, and vertically compressed; hind feet webbed; greatest length of skull more than 30 mm						Size much smaller, head and body 125 mm or less; tail short; greatest length of skull less than 30 mm
Artiodactyla  -  Carnivora  -  Chiroptera  -  Didelphimorphia  -  Insectivora  -  Lagomorpha  -  Rodentia  -  Xenarthra Scientific Names - Common Names