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Autumn is in full swing, and temperatures are dropping across the United States. And in America’s first national park, Yellowstone, wildlife species are transitioning and preparing for winter.

As the season shifts and the promise of snow lingers in the cool air, many of Yellowstone’s wildlife species move from high country to low country. Grazing elk herds relocate to areas where they can find food. Bison move to feeding zones near geysers and springs to benefit from the natural geothermal heat.

But bears behave in a different way: their appetites decrease, they become more sluggish, their coat thickens over layers of fat. They head to Yellowstone’s high country to build dens and sleep for the winter season. When a bear hibernates, they conserve energy by slowing their heart rate, metabolism and breathing.

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Learn more about how these animal species and others – such as big elk, mountain lions and owls – react to the cooling temperatures in Yellowstone National Park by watching Expedition Wild: Yellowstone Winter on Saturday November 6 at 8P et/pt!

Video Preview: To study Grizzly bear behavior in winter, Casey will travel 50 miles on foot through Yellowstone’s pristine backcountry.