When awake, polar bears spend 90 percent of their time foraging and hunting for food. Their diet includes, fish, seals, and occasionally birds and whale carcasses.
In the winter, these bears range broad distances on the ice as they travel South to stay near open water and shifting ice flows.
During the summer, polar bears range on the tundra feeding on leaves and fruits and an occasional muskox or caribou.
When in a zoo enclosure, cubs are often separated from their mothers because they require the warmth and solitude of a den during their first several months of life.
During the summer, zoo workers often change the bear's diet in order to reduce the thickness of their fat layer and keep them cool.
Polar bears do not like being enclosed and it sometimes makes is difficult to keep up with the maintenance of the encloser. Males have to be separated from the other bears because they are known to kill one another.