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Follow a runner in the world's most dangerous marathon.

A wildebeest calf is seized in the jaws of a lioness...find out what happens next!

Nighttime approaches, and Richard Terry finds something lurking in the very place he found shelter.

Adventurer Richard Terry is in Mekong, Thailand investigating attacks by a giant aquatic creature.

Ecologist Chris Morgan camps alongside bears in the Alaskan wilderness.

See how tough life is for the local grizzlies of Mount Denali.

In a dangerous attempt, crocodile eggs are taken from a nest for examination.

Matt encounters Borneo’s deadly king cobra.

Follow a crocodile from a dangerous catch to a release in the ocean.

After Matt hauls the big croc out, he gives the resident kids a lesson in croc safety.

Seasons dramatically transform the Nordic landscape.

A mother bear and her cubs face a potentially lethal threat in the forest.

Just hours old, the ducks follow their mother in search of food.

An owl finds food for it's offspring.

The serious job of finding food must be taught.