Two narratives -- the life cycle of a mother walrus and her calf, and the life of a polar bear and her cubs -- are used to illustrate the harsh realities of existence in the Arctic.

Siberian gulag escapees travel four thousand miles by foot to freedom in India.

Fifty years ago there were close to half-a-million lions in Africa. Today there are around 20,000. To make matters worse, lions, unlike elephants, which are far more numerous, have virtually no protection under government mandate ...

A team of storm chasers track a tornado.

A journey into the land of sharks. The old myth of swimming killing machines is put against the true nature of those rather peaceful hunters, whose evolution ended in biological perfection millions of years ago. We accompany exped...

Volcanoes, earthquakes, and tornadoes all can cause enormous damage, and predicting where and when they will strike is of great importance. Volcanologist Dr. Marie Edmonds has devised sensors that monitor the underground activity ...

In the Antarctic, every March since the beginning of time, the quest begins to find the perfect mate and start a family.