In "Ends of the Earth," Neil Shubin travels north and south to explore the frontiers of polar science and history.

Polar bears are born about as pathetic as humans, and the den protects them from the frigid weather as they grow 20 times their size in just a few months of nursing.

The Saint Louis Zoo announced Wednesday that they have exchanged one of their long-time resident polar bears for young polar bear twins from Toledo. Twelve-year-old polar bear Kali was moved this ...

A team of scientists led by the University of Toronto’s Louise Archer is shedding light on one of the most important yet poorly understood stages of polar bears’ lives – maternal denning, when polar ...