Islands: Nature’s Wild Laboratories

On Vancouver Island, black bears roam among ancient trees. Grey whales, eagles and sea lions feast on millions of Pacific herring at the onset of spring.

Off the eastern coast of Australia lies K'Gari, the largest sand island in the world - where every meal is hard won.

For half of the year, Baffin Island is locked in ice and nearly unfit for life. But when winter releases its grip, millions of visitors thrive while ice-loving locals struggle to survive.

Evolution is in overdrive on Borneo, resulting in an explosion of life. But the diversity of this island is threatened by the actions of humans.

In the Okavango Delta, the desert sun battles with floodwaters. Every animal, whether termite queen or elephant bull, must cope with never-ending change.

Over 2,000 years, humans have changed the face of Sri Lanka, creating both opportunities and obstacles for its wildlife.