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What features helped woolly mammoths survive cold Ice Age climates?

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Replica of a woolly mammoth with long curved tusks and shaggy fur on display in a museum exhibit, set against a dramatic painted landscape backdrop. — de-extinction The woolly mammoth (*Mammuthus primigenius*)—represented here by a replica in a Canadian museum—is an example of an extinct species that someday could be resurrected through de-extinction.

The woolly mammoth (Mammuthus primigenius) possessed several specialized physical adaptations that allowed it to thrive in the frigid environments of the Pleistocene ice ages:12

Insulating Coat: The mammoth had a dense, yellowish-brown undercoat approximately 2.5 cm (1 inch) thick, protected by a coarser outer layer of dark brown hair that could grow over 70 cm (27.5 inches) long.12
Subcutaneous Fat: Beneath its thick skin, the animal maintained a layer of insulating fat that reached up to 8 cm (3 inches) in thickness.13
Heat Conservation: Its ears were relatively small compared to those of modern elephants, which minimized the surface area exposed to the cold and reduced heat loss.12
Energy Reserves: A distinctive hump of fat on the mammoth's back served as a vital reservoir for energy and water, helping it survive in harsh tundra conditions.12

These features were essential for maintaining body temperature and managing resources in the cold steppe tundra habitats where the species lived.2