 It is reported that they occupy rough hillsides and ravines from sea level to 2,000 meters in elevation, that some populations use burrows and feed near the ground, and that other populations may den in tree cavities and move through the trees, rather than descend to ground level.Five of the seven species in this genus are known only by skeletal remains, often found in association with human kitchen middens.These five species probably disappeared by the seventeenth century because of excessive hunting by people.