A group of five adolescent male lions - dubbed the Musketeers - are wandering the desert looking to find their own kingdom. They come across a lioness, but not all seem interested in settling down.

Five Young Lion Brothers Mate with One Lioness (3:44)

A group of orphaned lion cubs are facing an uncertain future. If they're to survive into adulthood, they will have to convince their reluctant aunt to share her kill with them.

Hostile Lioness Withholds Food from Hungry Orphaned Cubs (3:09)

It's 1942 and the USS Silversides, a U.S. submarine submerged in the Pacific, is frantically trying to dodge depth charges dropped by a Japanese warship. Even a near miss could be catastrophic.

Why Depth Charges Don't Have to Touch a Submarine to Sink It (3:52)

During spawning season, calamari squid become vulnerable in the shallow waters. But they do have one weapon that helps improve their odds - lightning fast jet propulsion.

How Spawning Squid Offer a Buffet for Predators (2:58)

In a sandy gully, a school of razorfish are being stalked by an invisible predator and a master of disguise: the crafty cuttlefish.

A Clever Cuttlefish Goes in for the Kill (1:55)

They might be delicious to us but in the ocean, calamari squid are formidable predators, using concealed tentacles which shoot out toward any prey within a three-foot radius.

The Remarkable Way Calamari Squid Catch Their Prey (1:37)

A marauding polar bear is about to be returned to the the wild, as far away as possible from the town of Churchill. To do that, the conservation team will need to tranquilize him, and then airlift him by helicopter.

A Polar Bear Released Back Into the Wild by Helicopter (2:12)

Conservationists have tracked down a polar bear who has taken to venturing into nearby Churchill. The next step is to airlift him by helicopter to a holding facility, and then back into the wild.

How Churchill Protects Itself From Polar Bears (2:28)

The San Gabriel Mountains lure lots of Angelenos looking for some quiet seclusion. One of the more famous was Leonard Cohen who spent five years there, searching for peace of mind.

This Footage of Jaguars in Panama Could Save Their Lives (3:39)

Vying with the Russians for space supremacy, the U.S. successfully launches Apollo 8. Once in orbit, astronaut William Anders takes one of the most legendary photographs of all time.

This Apollo 8 Astronaut Took the Famous "Earthrise" Photo (2:43)

Famed fisherman and adventurer Andy Coetzee thinks he may have snared a giant barracuda. He hasn't, but he's caught another interesting and prized fish--the West African Tarpon.

An Intense Struggle to Catch a Giant West African Tarpon (3:10)

Tiger cub Kumal is entirely dependent on his mother to hunt prey. He also relies on his father for protection against intruders. Someday he will need to provide for himself, but for now, the support of his parents will do.

Mother Tiger Makes Speedy Kill to Feed Cubs (2:02)

Rising sea levels are threatening to flood Miami. In fact, some scientists estimate that the entire city could be underwater by the end of the 21st century.

The Biggest Threat Facing the City of Miami (2:19)

Hippos were once believed to be related to whales. They're both mammals, they both sleep underwater, and they both rise to breathe in their sleep, without waking.

Why People Believed Hippos Were Related to Whales (1:31)

The maze of lagoons in Loango National Park, in Gabon, isn't just a good place to hunt barracudas--it's also an ancient migratory route that leads to their ancestral breeding waters.

Why These Lagoons Are Full of Giant Barracuda (2:44)

The reddish hues of the vast dunes of the Namib Desert in southern Africa are a result of concentrations of iron in the sand. Over time, the air oxidizes the sand, causing it to rust.

Are the Sands of the Namib Desert Really Rusting? (1:32)

South African fisherman Andy Coetzee has his eyes set on a giant perch--a massive freshwater predator fish indigenous to the waters of Uganda. But just as he catches one, a nearby crocodile tries to get in on the action.

Fishing for Perch in Nile Crocodile-Filled Waters (3:08)

Fisherman and adventurer Andy Coetzee is going traditional with his bid to snare a giant perch: He's using live bait and his tried-and-true wooden Scarborough.

Catching a Giant 30-lb. Perch With a Wooden Reel (2:37)

Fisherman Andy Coetzee is in the middle of a dangerous dive, in the shark-filled waters of the Indian Ocean. He's on the lookout for a fierce and elusive giant predator: the dogtooth.

Braving Shark-Infested Waters for a Look at This Big Fish (3:05)

This gliding tree frog uses its webbing as a parachute. It's a great escape mechanism, especially when being pursued by a deadly boa

Tree Frog Effortlessly Skydives Away from Hungry Snake (3:31)