A band of rockhopper penguins come together to chase off a group of vultures threatening their chicks.

The Penguin Cams used to film Penguins: Waddle All the Way took a serious beating, from being knocked off rocky ledges to being attacked by the penguins themselves.

A male penguin flirts with a lifelike Penguin Cam while his mate is at sea. When she returns, the feisty female takes on the animatronic home wrecker.

A jealous female penguin has here eye on a handsome male, so she steps in and starts a flipper fight with his new mate.

Penguins are tough birds, and to prove it, Discovery and BBC are spying on them! Ultra-realistic Penguin Spy Cams offer an unprecedented look at penguins.

A band of rockhopper penguins come together to chase off a group of vultures threatening their chicks.

The Penguin Cams used to film Penguins: Waddle All the Way took a serious beating, from being knocked off rocky ledges to being attacked by the penguins themselves.

A male penguin flirts with a lifelike Penguin Cam while his mate is at sea. When she returns, the feisty female takes on the animatronic home wrecker.

A jealous female penguin has here eye on a handsome male, so she steps in and starts a flipper fight with his new mate.

For every incredible moment of footage in the Africa series, there are countless stories of filmmaking hardship. See what it was really like to make Africa.

In this behind-the-scenes web exclusive, Africa producer Hugh Pearson reveals how one of the most violent giraffe fights ever seen was filmed.

Go behind the scenes of AFRICA with wildlife cameraman Charlie Hamilton James, who explains how he filmed the lizards and lions sequence.

In Man, Cheetah, Wild, Kim Wolhuter gets closer than you've ever seen to wild cheetahs.

An F5 tornado is heading straight for the hospital where Shay-la is having her labor induced. She's already had the epidural so there's no stopping the labor now.

A baby mountain goat gets separated from its mother and must battle the raging rapids to be reunited.

In this deleted scene from North America, gray wolves hunt caribou in Labrador, Canada. Their hungry pups are counting on them to make a successful kill.

Watch a special sneak peek of the epic seven-part series North America. Discovery.com/NorthAmerica

Untamed wilderness is just beyond our own backyards. North America, the next groundbreaking natural history series from Discovery Channel. Discovery.com/NorthAmerica

In the wintry foothills of North America, a baby black bear's life begins. He must "learn the ropes" from mom in order to survive.

Go behind the scenes of the fighting mustangs sequence with North America cinematographer Sophie Darlington.

Olive Ridley sea turtle hatchlings run the gauntlet in Costa Rica. Only 5 out of 100 will make it through their first 8 hours out of the nest.