The Family Aplodontiidae belongs to the order of rodent-like animals called the Aplodontiidae or mountain beavers. These animals are found only in North America and are unique in having several physical and behavioral traits that set them apart from other rodents. Some of the synonyms for the Family Aplodontiidae include the mountain beaver family, the sewellel family, and the hairy-tailed mole family. These synonyms are used interchangeably to refer to this group of small, furry animals that are primarily herbivorous and live in burrows underground. Despite their name, mountain beavers are not true beavers and are more closely related to rodents like mice and squirrels.