Polar bears live on ice and snow, but that’s not a problem—these bears have some cool ways to stay warm with two different layers of hair and thick fat.
During winter, many bears stay warm by making a denThe home or dwelling of an animal, usually in the ground, a tree hollow, or a cave. and sleeping. Polar bears do not hibernate, but their body functions do slow down at this time. This is called “winter sleep,” as the bears can easily be awakened. A mother bear can give birthThe beginning of an animal's life. and nurse her young while in her winter sleep.
For such a big animalAny living thing that is not a plant. Most animals can move about freely. All use plants or other animals as food. All have sensory organs., polar bears sure start out small! A cub is about the size of a stick of butter when it is born. Milk from polar bear mothers is 35 percent fat; this helps the cubs grow quickly. By springtime they weigh more than 20 pounds and start exploring with their mother outside the denThe home or dwelling of an animal, usually in the ground, a tree hollow, or a cave..