The Yukon is a true wilderness, one of the last on Earth. The vast land got its name from its longest river, which the Gwich'in, one of the indigenous people of the region, call "Yu-kun- ah", or, the "great river". The third longest waterway in North America, the Yukon River flows through wide open valleys and narrow channels over 3,000 km Northwest towards the storm tossed Bering Sea.

The Lilayi Elephant Nursery near Lusaka in Zambia is home to four orphan elephants. The two oldest, four-year- olds Musolole and Zambezi, have been here since they were just a few months old. These boisterous babies are out-growing the nursery and it's time to move to big school. Two hundred miles away, in the heart of Kafue National Park, lies elephant heaven – Camp Phoenix, the project's release facility, where older orphans are already adapting to life in the wild.

Stalk the seas with sharks as they hunt using heightened senses and killer instincts. Watch a whitetip reef shark put its electrical sensors to work finding its prey's heartbeat, and the pelagic thresher shark stun its quarry with its whiplike tail.

Navigate the ocean's vast distances, depths, and darkness with nomadic sharks that thrive in the blue emptiness. Meet a lone blue shark traversing stormy Atlantic seas, and hundreds of hammerheads returning to their Pacific island breeding ground.

Power-up with alphas who use might to subdue enemies. Marvel when sea lions throw their weight around to win a mate, Cape buffalo deliver knockout punches, Canada geese hit hard with their wings, and lionesses rule the savannah with an iron paw.

Confront alphas with faces only a mother could love. Inspect warthogs' lumpy armour, giant African bullfrogs' outsized jumping and biting skills, wild turkeys' sharp beaks and razorlike spurs, and Nile crocodiles' crushingly powerful jaws.

Spend one day and one night in Zambia's Luangwa Valley with Africa's most fearsome hunters-a pride of lions. The lions are hungry because they haven't managed to make a large kill in days and tempers are starting to flare.

In Zambia, no single creature survives in isolation. From lions and leopards to jumping spiders and bee-eating mantises, study the diverse network of animals and plants that makes the Luangwa Valley one of the most magical wildernesses in Africa.

The animal kingdom can be a harsh place, but some baby animals have a family ready to take care of their needs. Meet some of these adorable babies and their clans: a koala joey, European elk twins, a litter of Asian short-clawed otters, and black howler monkey youngsters.

Spend one day and one night in Zambia's Luangwa Valley with Africa's most fearsome hunters-a pride of lions. The lions are hungry because they haven't managed to make a large kill in days and tempers are starting to flare.

In Zambia, no single creature survives in isolation. From lions and leopards to jumping spiders and bee-eating mantises, study the diverse network of animals and plants that makes the Luangwa Valley one of the most magical wildernesses in Africa.

Test limits with jaguar cub Frida, who's honing her survival skills in Brazil's Caiman Lodge Reserve. Learn how to sneak with mum Gatuna, see sister Anouk help her hide from hungry interlopers, and go on a reckless solo trek that takes a lucky turn.

Throughout the Hawaiian Islands, natural forces of creation and destruction can be observed in real-time as they work to shape the living beach. These beaches are forged inside active volcanoes: every bit of land exists here because of these red-hot furnaces.

It's a UNESCO World Heritage Site, the largest sand island on earth, and home to wild dingoes, six-foot sand-worms, and eucalyptus woodlands. Find out how everything lives happily together in a complex ecosystem built entirely upon sand.

It's November at Cape Tatnam. Winter is coming to the lower Western shore of Hudson Bay. But the ice – which should be forming on Hudson Bay by now – is nowhere to be seen. 2016 has been the warmest year on record. In late November, the temperature is 10 degrees warmer than its average. Climate change is wreaking havoc across the North. At just below zero degrees Celsius, the sea cannot freeze.

Kasanka National Park in Zambia is home to an unusual species of baboon. Kinda baboons have turned their backs on the aggressive displays of dominance usually associated with these large monkeys and lead altogether more peaceful lives. Living alongside one troop is a dedicated team of researchers whose mission it is to uncover these baboons' secrets and understand what makes them who they are.

Spend one day and one night in Zambia's Luangwa Valley with Africa's most fearsome hunters-a pride of lions. The lions are hungry because they haven't managed to make a large kill in days and tempers are starting to flare.

In Zambia, no single creature survives in isolation. From lions and leopards to jumping spiders and bee-eating mantises, study the diverse network of animals and plants that makes the Luangwa Valley one of the most magical wildernesses in Africa.

Sidle up to lone wolf alphas who'd rather go solo. Take a glacial stroll alongside a Galápagos tortoise; dance with venomous European adders; watch a face-tearing battle between Lacerta lizards; and gasp at leopard seals' amazing stealth attacks.

Connect with Earth's most talkative species. Meet capuchin monkeys, who definitely don't take a vow of silence; endure Eurasian river otters' chilling screams; face angry fruit bats' loud complaints; and explore orcas' human-scale speech systems.

Throughout the Hawaiian Islands, natural forces of creation and destruction can be observed in real-time as they work to shape the living beach. These beaches are forged inside active volcanoes: every bit of land exists here because of these red-hot furnaces.

It's a UNESCO World Heritage Site, the largest sand island on earth, and home to wild dingoes, six-foot sand-worms, and eucalyptus woodlands. Find out how everything lives happily together in a complex ecosystem built entirely upon sand.

It's November at Cape Tatnam. Winter is coming to the lower Western shore of Hudson Bay. But the ice – which should be forming on Hudson Bay by now – is nowhere to be seen. 2016 has been the warmest year on record. In late November, the temperature is 10 degrees warmer than its average. Climate change is wreaking havoc across the North. At just below zero degrees Celsius, the sea cannot freeze.

Kasanka National Park in Zambia is home to an unusual species of baboon. Kinda baboons have turned their backs on the aggressive displays of dominance usually associated with these large monkeys and lead altogether more peaceful lives. Living alongside one troop is a dedicated team of researchers whose mission it is to uncover these baboons' secrets and understand what makes them who they are.

Spend one day and one night in Zambia's Luangwa Valley with Africa's most fearsome hunters-a pride of lions. The lions are hungry because they haven't managed to make a large kill in days and tempers are starting to flare.

In Zambia, no single creature survives in isolation. From lions and leopards to jumping spiders and bee-eating mantises, study the diverse network of animals and plants that makes the Luangwa Valley one of the most magical wildernesses in Africa.

Test limits with jaguar cub Frida, who's honing her survival skills in Brazil's Caiman Lodge Reserve. Learn how to sneak with mum Gatuna, see sister Anouk help her hide from hungry interlopers, and go on a reckless solo trek that takes a lucky turn.

Throughout the Hawaiian Islands, natural forces of creation and destruction can be observed in real-time as they work to shape the living beach. These beaches are forged inside active volcanoes: every bit of land exists here because of these red-hot furnaces.

It's a UNESCO World Heritage Site, the largest sand island on earth, and home to wild dingoes, six-foot sand-worms, and eucalyptus woodlands. Find out how everything lives happily together in a complex ecosystem built entirely upon sand.

It's November at Cape Tatnam. Winter is coming to the lower Western shore of Hudson Bay. But the ice – which should be forming on Hudson Bay by now – is nowhere to be seen. 2016 has been the warmest year on record. In late November, the temperature is 10 degrees warmer than its average. Climate change is wreaking havoc across the North. At just below zero degrees Celsius, the sea cannot freeze.