The beaches of California are some of the most beautiful in the world, but are they falling out of balance due to mankind's effects on nature? What does it take for the magnificent fauna of the Pacific Coast to keep living… on the "living beach"?

At the water's edge a brave group of male penguins gather, preparing to make the dangerous journey ashore. With many threats ahead, there is safety in number and these petite penguins have important business to attend. It's time to breed and they must find a burrow before the females arrive.

After the dry season lowers the waters, siblings Kimba and Maya risk crossing the river to search for their parents. They run the gauntlet of the densest populations of crocs and hippos in Africa, and face an even greater threat on the other side.

More than 200 caves play host to an unmatched array of marine life and coral formations in this underwater kingdom 40 kilometres from Belize City. It's a deep blue wilderness brimming with rare, exotic fish, eagle rays, sharks, and huge green morays.

Clear waters, deep reefs, dangerous caves, and tunnels draw divers to the island of Cozumel on Mexico's east coast. The Caribbean Sea port is home to multicoloured schools of fish, bull sharks, and gigantic sea turtles.

As far as invasive species go, Asian carp are some of the nastiest invaders around. They've thus far made their way up America's waterways, snaking up the Illinois river, eating voraciously, breeding quickly, and decimating native fish populations and their food supplies.

More than 200 caves play host to an unmatched array of marine life and coral formations in this underwater kingdom 40 kilometres from Belize City. It's a deep blue wilderness brimming with rare, exotic fish, eagle rays, sharks, and huge green morays.

Clear waters, deep reefs, dangerous caves, and tunnels draw divers to the island of Cozumel on Mexico's east coast. The Caribbean Sea port is home to multicoloured schools of fish, bull sharks, and gigantic sea turtles.

Observe blossoming friendships and interspecies bonds in nursery school, and peek inside a bromance among junior-school buds Valentino, Yutris and Madara. See distractible Beni lean into his love of food and get a beating from a more-senior pupil.

Lewa Conservancy is working to return elephants to territory from Mt. Kenya to Samburu National Park. They've also created an elephant exclusion zone to try and restore a damaged ecosystem. Radio tracking collars are used for both initiatives to help conservationists better understand the elephants' needs – and to see if they're returning to their natural corridors.

Elephant hunting has been banned in Kenya for 40 years. Organized gangs of armed poachers are still targeting elephants, illegally hunting them and selling their ivory tusks on the black market. Environmentalists and conservationists are sounding the alarm.

The Eastern Grey kangaroo is a sociable species, clustering together in small groups known as mobs. A mob is a social network focused on feeding, where members will come and go as they please, depending on the availability of food.

In Southern Florida, a unique and complex ecosystem known as the Everglades has entered its winter season. Predator and prey are forced to live in close proximity due to a limited supply of water.

More than 200 caves play host to an unmatched array of marine life and coral formations in this underwater kingdom 40 kilometres from Belize City. It's a deep blue wilderness brimming with rare, exotic fish, eagle rays, sharks, and huge green morays.

Clear waters, deep reefs, dangerous caves, and tunnels draw divers to the island of Cozumel on Mexico's east coast. The Caribbean Sea port is home to multicoloured schools of fish, bull sharks, and gigantic sea turtles.

During the last few weeks of the dry season, the prides stick close to the only available water in the river. But in Luangwa, that proximity spells danger – especially when the scent of a hippo kill compels the Hollywoods to cross the river.

Lewa Conservancy is working to return elephants to territory from Mt. Kenya to Samburu National Park. They've also created an elephant exclusion zone to try and restore a damaged ecosystem. Radio tracking collars are used for both initiatives to help conservationists better understand the elephants' needs – and to see if they're returning to their natural corridors.

Elephant hunting has been banned in Kenya for 40 years. Organized gangs of armed poachers are still targeting elephants, illegally hunting them and selling their ivory tusks on the black market. Environmentalists and conservationists are sounding the alarm.

The Eastern Grey kangaroo is a sociable species, clustering together in small groups known as mobs. A mob is a social network focused on feeding, where members will come and go as they please, depending on the availability of food.

In Southern Florida, a unique and complex ecosystem known as the Everglades has entered its winter season. Predator and prey are forced to live in close proximity due to a limited supply of water.

More than 200 caves play host to an unmatched array of marine life and coral formations in this underwater kingdom 40 kilometres from Belize City. It's a deep blue wilderness brimming with rare, exotic fish, eagle rays, sharks, and huge green morays.

Clear waters, deep reefs, dangerous caves, and tunnels draw divers to the island of Cozumel on Mexico's east coast. The Caribbean Sea port is home to multicoloured schools of fish, bull sharks, and gigantic sea turtles.

Observe blossoming friendships and interspecies bonds in nursery school, and peek inside a bromance among junior-school buds Valentino, Yutris and Madara. See distractible Beni lean into his love of food and get a beating from a more-senior pupil.

Lewa Conservancy is working to return elephants to territory from Mt. Kenya to Samburu National Park. They've also created an elephant exclusion zone to try and restore a damaged ecosystem. Radio tracking collars are used for both initiatives to help conservationists better understand the elephants' needs – and to see if they're returning to their natural corridors.

Elephant hunting has been banned in Kenya for 40 years. Organized gangs of armed poachers are still targeting elephants, illegally hunting them and selling their ivory tusks on the black market. Environmentalists and conservationists are sounding the alarm.

The Eastern Grey kangaroo is a sociable species, clustering together in small groups known as mobs. A mob is a social network focused on feeding, where members will come and go as they please, depending on the availability of food.

In Southern Florida, a unique and complex ecosystem known as the Everglades has entered its winter season. Predator and prey are forced to live in close proximity due to a limited supply of water.

More than 200 caves play host to an unmatched array of marine life and coral formations in this underwater kingdom 40 kilometres from Belize City. It's a deep blue wilderness brimming with rare, exotic fish, eagle rays, sharks, and huge green morays.