The order Rodentia, the "gnawing" mammals, contains over 40% of all species in the class Mammalia. A consistent diagnostic character for all rodents is an upper and lower pair of arc-shaped chisel-edged incisors. Rodents have adapted to most habitats and include terrestrial, fossorial, saltatorial, arboreal, gliding, and semiaquatic forms. They range in size from the smallest mice, weighing only a few grams, up to the largest living rodent, the capybara, weighing up to 50 kilograms. Most rodents are primarily omnivorous, feeding on bark, grass, seeds, other vegetation, insects and other animal matter. With a few exceptions, an external tail is present, but its form and length vary greatly. Rodents are well haired over most of their body. Most are quadrupedal, but some arid-land species have greatly enlarged hind limbs, and are capable of ricochetal locomotion. The distribution of rodents is almost worldwide. They are native to most land areas except some Arctic and oceanic islands, New Zealand and Antarctica.

Family Aplodontiidae

Family Sciuridae
Subfamily Sciurinae
Tribe Sciurini

Tribe Pteromyini

Subfamily Xerinae
Tribe Marmotini

Family Gliridae
Subfamily Glirinae

Family Castoridae

Family Heteromyidae
Subfamily Dipodomyinae

Family Geomyidae

Family Muroidae
Subfamily Cricetidae
Tribe Arvicolinae

Tribe Neotominae

Subfamily Muridae
Tribe Gerbillinae

Tribe Murinae

Family Erethizontidae
Subfamily Erethizontinae

Family Chinchillidae

Family Caviidae
Subfamily Caviinae

Subfamily Hydrochoerinae

Family Dasyproctidae

Family Octodontidae

  • Degu (Octodon degus)

Family Abrocomidae

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