In fact, to move at any speed the polar bear uses twice as much energy as do most other mammals.

The polar bear, which lives on the polar ice-cap, will lose its home and die out.

To survive, the polar bear must keep its body at the right temperature and store enough energy to last between meals that could be a few days or a few months apart.

Patterns of freeze-up and breakup influence the distribution and number of seals, the polar bear's main prey.

Take a moment to imagine what the polar bear's environment is like.