A bear's home is called a den, a crucial place for hibernation and raising young. Bears often use natural shelters like caves, hollow trees, or dug-out spaces under large roots or rocks as dens. During hibernation, which can last several months, bears enter their dens to conserve energy and survive the winter without needing to forage. These dens also serve as a safe space for mother bears to give birth and care for their cubs until they are ready to venture outside.