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Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing.

Forty percent of mammal species are rodents, and they are found in vast numbers on all continents other than Antarctica. Common rodents include mice, rats, squirrels, porcupines, beavers, guinea pigs, and hamsters. Rodents have sharp incisors that they use to gnaw wood, break into food, and bite predators. Most eat seeds or plants, though some have more varied diets. Some species have historically been pests, eating seeds stored by people and spreading disease.

Dasyproctidae is a family of large South American rodents, comprising the agoutis and acouchis. Their fur is a reddish or dark colour above, with a paler underside. They are herbivorous, often feeding on ripe fruit that falls from trees. They live in burrows, and, like squirrels, will bury some of their food for later use.

Fossil taxa follow McKenna and Bell (1997), with modifications following Kramarz (2005).

The pacas (genus Cuniculus) are placed by some authorities (Woods, 1993;McKenna and Bell, 1997) in the Dasyproctidae, but molecular studies have demonstrated that they do not form a monophyletic group (Rowe and Honeycutt, 2002).

The popular term (Common) Agouti designates several rodent species of the genus Dasyprocta that inhabit areas of Middle America, the West Indies, and northern South America. They are related to guinea pigs and look quite similar but have longer legs. The species vary in color from tawny to dark brown with lighter underparts. Their body is covered with coarse hair which is raised when alarmed. They are about 20 inches (51 cm) in length with a short hairless tail.

Confusingly, the related pacas were placed by some authorities in a genus called Agouti, though Cuniculus has priority and is the correct term (Woods and Kilpatrick, 2005).