where do bears hibernate

Bears hibernate in dens that vary widely depending on the habitat and the bear species. These dens can be dug by the bears themselves or be natural shelters such as root masses, rock crevices, hollow trees, or even human-made structures like buildings or porches. The ideal den location tends to be a dry, sheltered spot often on a north-facing slope with well-drained soil to keep the den dry. Bears may use the same den for several years, and dens are often very clean inside as bears do not urinate or defecate during hibernation. In colder climates like Alaska, bears may hibernate for up to 7 months in these dens, which protect them from harsh weather while they undergo a winter torpor state. Bears in warmer southern regions may den for shorter periods and in less deep sleep states. Pregnant females typically select more protected den sites, such as dense thickets, tree cavities, or under fallen logs to give birth and nurse cubs during hibernation. Some bears may even hibernate without elaborate dens, especially in dry or sheltered environments. In summary, bears hibernate in a variety of dens — dug, natural, or adapted — that provide shelter, dryness, and protection during winter rest.