Researchers think that ground sloths could have been pushed out by an oncoming ice age, or competition with other species, maybe humans, who arrived in the region around the time most of the sloths went extinct.
Para peneliti berpikir bahwa kungkang tanah kemungkinan digeser oleh zaman es yang mendekat, atau kompetisi dengan spesies lain, mungkin manusia, yang datang di kawasan tersebut kira-kira ketika sebagian besar kungkang punah.