YELLOWSTONE NATIONAL PARK, Wyo.– Earlier this month, a black bear was captured on video preparing to hibernate this winter in Yellowstone National Park.

In the video, the bear drags dirt and other debris towards its den before slowly retreating deep into the hole and settling there.

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A black bear crawls back into its den to enter torpor, a sleep state similar to hibernation, in Yellowstone National Park.

(Grant Johnson via Storyful/FOX Weather)

Unlike some animals, bears do not truly hibernate, but do enter a sleep state called torpor. As in hibernation, the animal’s heart rate, body temperature and metabolism also decrease during torpor. Unlike hibernation, torpor is not voluntary and does not last as long as normal hibernation, reports the National Forest Foundation.

Hibernation and torpor typically begin in fall and end in spring. During hibernation and torpor, animals use their fat reserves to survive the winter, according to the National Forest Foundation.

A black bear shovels dirt and debris into its den to overwinter.

(Grant Johnson via Storyful/FOX Weather)

During torpor, bears, like most hibernating animals, often do not need to urinate or defecate. According to the National Forest Foundation, bears can go up to 100 days without leaving their den to seek food, water or relieve themselves.

Grant Johnson, a wildlife guide with the Yellowstone Safari Company, captured the video of the bear collecting grass and leaves in its den. “It’s unusual to see them coming out of their burrows at all when they’re roosting in the fall,” he said in a post on Instagram.