Many animals hibernate during winter to conserve energy when food is scarce. Bears enter dens and slow their metabolism, living off stored fat until spring. Hedgehogs curl up into tight balls and sleep for months, relying on their insulated nests to stay warm.
Other hibernating animals include groundhogs, bats, and frogs, which lower their body temperature dramatically to survive freezing temperatures. This fascinating survival strategy allows these creatures to endure harsh winters with ease.