Bears are large, powerful mammals found in various habitats around the world, including forests, mountains, and tundras. They belong to the family Ursidae and are known for their thick fur, strong limbs, and keen sense of smell. There are eight species of bears, including the American black bear, grizzly bear, and polar bear, each adapted to their unique environments. Bears are omnivores, meaning they eat both plants and animals. Their diet can include berries, nuts, fish, and small mammals. During the winter, many bears enter a state called hibernation, where they sleep for months to conserve energy when food is scarce.