As the animal families escape the drought, the land returns to its former beauty; new life is born, old rivalries are laid to rest, and new alliances are forged.

A group of chimps in Senegal is led by an alpha male named Dave.

A colony of emperor penguins arrive in Atka Bay, after three months at sea, to raise their chicks through the coming winter.

The leader of a once mighty lion pride must now battle for their very survival; a look at whether or not this extraordinary lioness can save her family from disaster.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

The jungle, underwater caves and lush everglades of the Yucatan shelter Mexico's largest predator, Morelet's crocodile.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

The jungle, underwater caves and lush everglades of the Yucatan shelter Mexico's largest predator, Morelet's crocodile.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

A team of forensic experts excavate a giant Pliosaur skull, the largest Jurassic predator ever known.

David Attenborough travels from the Arctic to the Antarctic to discover magical new ice worlds inhabited by the most extraordinary animal survivors on earth.

Spring in the polar regions; the greatest seasonal transformation of the planet begins with the return of the sun.

It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

Winter is the greatest test for life in the polar regions; in the Arctic, a female polar bear treks into the mountains to give birth; out on the frozen ocean, the entire population of the world's spectacled eider ducks braves the winter.

David Attenborough travels from the Arctic to the Antarctic to discover magical new ice worlds inhabited by the most extraordinary animal survivors on earth.

Human survival in polar areas relies on ancient wisdom and modern science; a look at the riches and wonders of the polar regions and the people that have been visiting them for thousands of years.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Alaskans push through the deep cold to increase their odds of survival.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical Humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

Alaskans push through the deep cold to increase their odds of survival.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

At the top of the planet lies the Arctic Ocean; after four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice; mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

Going back to the far North of the planet where the largest land habitat on Earth exists, home to great Boreal forests and the barren tundra.

Coming face to face with the scientists bearing witness to history's profound climate shift; pondering the effect these changes have on Earth's human and animal communities, mapping the destruction from space and learning how to save the planet.

A team of forensic experts excavate a giant Pliosaur skull, the largest Jurassic predator ever known.

After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring; to survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

Ann Jones heads to Rosemary Island, WA to join turtle scientists on their annual nest survey; it's hot work, but worth it, females laying eggs; flatback hatchlings and she even wrestles a green turtle.

Steve searches for deadly animals living in the capital of Suriname, from snakes in people's gardens to snail-catching kites and one of the deadliest snakes on earth.

The trio heads to South Africa where they encounter the great white shark.

Seeking a mate, leopard Olimba begins a new chapter, but in her way is her daughter; the hyenas' strength is growing, but a flooded den spells disaster, and the clan become separated.

Ann Jones heads to Rosemary Island, WA to join turtle scientists on their annual nest survey; it's hot work, but worth it, females laying eggs; flatback hatchlings and she even wrestles a green turtle.

Steve searches for deadly animals living in the capital of Suriname, from snakes in people's gardens to snail-catching kites and one of the deadliest snakes on earth.

The trio heads to South Africa where they encounter the great white shark.

In the heart of central Mexico, lies Sierra Gorda, a region that is home to bobcats, pumas and flying squirrels.

Alaskans stand their ground as winter brings one final barrage.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

The male penguins hand over their newborns to the returning females.

Alaskans stand their ground as winter brings one final barrage.

Learning the secret of rehabilitating seals from experts at Vancouver Aquarium; search and rescue is launched.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

Learning the secret of rehabilitating seals from experts at Vancouver Aquarium; search and rescue is launched.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

An epic journey into the unknown, a realm that feels almost like science fiction.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Coasts are the most changeable habitats of the ocean world.

Pioneers strive to protect the ocean from the effects of human activity.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

Prince William, along with members of the Earthshot Prize Council, including Sir David Attenborough and former Japanese astronaut Naoko Yamazaki, uncovers personal stories of people affected by air pollution and of those determined to clean our air.

Sir David Attenborough reveals new animal behaviors in the ocean.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Prince William, along with members of the Earthshot Prize Council, including Sir David Attenborough and former Japanese astronaut Naoko Yamazaki, uncovers personal stories of people affected by air pollution and of those determined to clean our air.

Sir David Attenborough reveals new animal behaviors in the ocean.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Alaskans brave the awakening landscape as the end of Winter nears.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

After tough early months, the penguin chicks are becoming more independent and are often left behind as their parents fish; follow along as they leave the security of home to return many years later to the same spot to breed.

Alaskans brave the awakening landscape as the end of Winter nears.

Hope recruits an unlikely wildlife rescuer.

Iceland is the world's largest volcanic island and new ground is born daily.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Hope recruits an unlikely wildlife rescuer.

Iceland is the world's largest volcanic island and new ground is born daily.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Remote islands offer sanctuary; pygmy three-toed sloth resides on a Caribbean island; nesting albatross thrive in isolation.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

From the jungles of Brazil to Costa Rica, animals face life in the most competitive place on Earth.

The hostile conditions of Earth's desert regions give rise to the most incredible survival stories on Earth.

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth, but hostile seasons pose a survival risk.

Cities serve as places of surprising opportunity for animals to thrive.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Exploring fossils from a North Dakota site that may reveal what happened when an asteroid struck Earth and wiped out the dinosaurs.

As winter turns to spring, Alaskans must seize the warming days.

Around 12,000 years ago, as the Ice Age finally thaws, humanity makes a dramatic shift - abandoning nomadic life for permanent settlements.

Levison travels into east Greenland's vast Arctic wilderness in search of elusive polar bears; he learns about the lives of these apex predators and their environment.

As winter turns to spring, Alaskans must seize the warming days.

Around 12,000 years ago, as the Ice Age finally thaws, humanity makes a dramatic shift - abandoning nomadic life for permanent settlements.

The trio heads to South Africa where they encounter the great white shark.

As winter comes to an end, Alaskans journey, hunt, and prepare for spring.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Hope recruits an unlikely wildlife rescuer.

As winter comes to an end, Alaskans journey, hunt, and prepare for spring.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Iceland's volcanoes generate one third of earth's land-based lava, but the land was sculpted by ice.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

Sir David Attenborough reveals new animal behaviors in the ocean.

Trekking across habitats where the rains determine life or death; following an ostrich chick in the fiery Namib Desert; a baboon vies for a sip at a watering hole; a maned wolf in a grassy Brazilian oasis.

Explaining how freshwater is the lifeblood of planet Earth and why animals depend on it for their survival.

Exploring forests as hidden worlds where the lives of animals are entwined, including temperate forests home to whistling wild dogs, as well as rainforests where ninja treehoppers fight off assassin bugs.

Animals fight to survive extremes, from tundra to deserts, mountain summits to deep underground.

Questions about how animals adapt to the worlds built by the planet's most invasive species, humans; a search for loot to steal with macaques in Bali; hunting for easy eats with bears in Lake Tahoe; whale poo help fish populations bounce back.

Conservation advocates take risks to save wildlife by exploring remote jungles, going undercover to catch criminals and making a microlight journey to lead endangered birds to safety.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

The same 92 elements that exist on Earth can be found throughout the cosmos.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

The same 92 elements that exist on Earth can be found throughout the cosmos.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Some tasks in the Arctic require remote Alaskans to venture off trail.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

Examine strange relics forgotten by time; visit a perturbing circle of stone in the Golan Heights; a mountain of headless statues in Turkey; a castle left to crumble in the Saudi Arabian desert; a time-worn secret in the wilds of Peru.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

Costa Rica is a world of its own; a tropical corridor squeezed between two great oceans, powered by rivers and volcanoes; its volcanoes erupt and deposit minerals into the soil, making the land fertile and creating the country's rich bio-diversity.

Take a deep dive into watery enigmas; glide over a sunken Italian city; a unique underwater cemetery in the Florida Keys; a yellow brick road to nowhere in the depths of the North Pacific; puzzling rocky constructions off the coast of Australia.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

Hope recruits an unlikely wildlife rescuer.

The male penguins hand over their newborns to the returning females.

After tough early months, the penguin chicks are becoming more independent and are often left behind as their parents fish; follow along as they leave the security of home to return many years later to the same spot to breed.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Prince William, along with members of the Earthshot Prize Council, including Sir David Attenborough and former Japanese astronaut Naoko Yamazaki, uncovers personal stories of people affected by air pollution and of those determined to clean our air.

Sir David Attenborough reveals new animal behaviors in the ocean.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Seeking a mate, leopard Olimba begins a new chapter, but in her way is her daughter; the hyenas' strength is growing, but a flooded den spells disaster, and the clan become separated.

Coasts are the most changeable habitats of the ocean world.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Steve and his team are venturing into the heart of Suriname, to kayak an unnamed river.

Coasts are the most changeable habitats of the ocean world.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Steve and his team are venturing into the heart of Suriname, to kayak an unnamed river.

Coasts are the most changeable habitats of the ocean world.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Steve and his team are venturing into the heart of Suriname, to kayak an unnamed river.

The same 92 elements that exist on Earth can be found throughout the cosmos.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Iceland is the world's largest volcanic island and new ground is born daily.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Prince William, along with members of the Earthshot Prize Council, including Sir David Attenborough and former Japanese astronaut Naoko Yamazaki, uncovers personal stories of people affected by air pollution and of those determined to clean our air.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Ann Jones heads to Rosemary Island, WA to join turtle scientists on their annual nest survey; it's hot work, but worth it, females laying eggs; flatback hatchlings and she even wrestles a green turtle.

Steve searches for deadly animals living in the capital of Suriname, from snakes in people's gardens to snail-catching kites and one of the deadliest snakes on earth.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Cities are one humanity's greatest inventions, they bring people together and drive wealth, but as more of people flock to live and work in them, they have to become greener, more sustainable and efficient places to live.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Cities are one humanity's greatest inventions, they bring people together and drive wealth, but as more of people flock to live and work in them, they have to become greener, more sustainable and efficient places to live.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical Humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

The male penguins hand over their newborns to the returning females.

After tough early months, the penguin chicks are becoming more independent and are often left behind as their parents fish; follow along as they leave the security of home to return many years later to the same spot to breed.

Emperor penguins cross a dangerous frozen sea to reach their breeding grounds; rockhoppers brave stormy seas and a 300-foot cliff; tropical Humboldt penguins face sea lions and vampire bats as they make their way to their desert nests.

The male penguins hand over their newborns to the returning females.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

The highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

The highest tides in the world are found in the Bay of Fundy on Canada's east coast.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

Alaskans contend with the throes of the warm season in the Arctic.

Exploring the worst mass extinction the planet has ever seen, when as much as 90% of all species died 252 million years ago; this moment in Earth's history took life to the brink, wreaking havoc and destruction on an unprecedented scale.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

Alaskans contend with the throes of the warm season in the Arctic.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

Ann Jones heads to Rosemary Island, WA to join turtle scientists on their annual nest survey; it's hot work, but worth it, females laying eggs; flatback hatchlings and she even wrestles a green turtle.

Steve searches for deadly animals living in the capital of Suriname, from snakes in people's gardens to snail-catching kites and one of the deadliest snakes on earth.

Around 12,000 years ago, as the Ice Age finally thaws, humanity makes a dramatic shift - abandoning nomadic life for permanent settlements.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Alaskans contend with the throes of the warm season in the Arctic.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

Alaskans contend with the throes of the warm season in the Arctic.

Hope learns all she can from a birds of prey rehab.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Hope learns all she can from a birds of prey rehab.

Along the west coast of Great Britain, the world's longest uninterrupted footpath forges through more than 800 miles of breathtaking scenery; the diverse landscape of the Welsh coast is a geological treasure.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Hope learns all she can from a birds of prey rehab.

Alaskans harness the power of the sun as they toil through summer.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

Alaskans harness the power of the sun as they toil through summer.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

In Moreton Bay, Dr. Ann gets in the water with a dugong as part of the world's largest dugong health check; a critical mission to help save the species globally; she learns that many dugong secrets can be found in their poo!

Head to Zambia's Liuwa Plain, where Steve tracks a young female cheetah that shows him how these supercharged cats hunt; learn what's pushing her species to the brink of extinction; hold your breath as bloodthirsty hyenas circle her territory.

The boys are in Laos in search of a diabolical catfish, but the best place to find it is near the mouth of Mekong, where it is believed that there is a hidden world. It is a difficult journey and the road is full of evil spirits.

Injured wild dog Flint helps care for Storm's largest ever litter of pups; leopard Mutima searches for a home; the lions are challenged by forces beyond their control.

In Moreton Bay, Dr. Ann gets in the water with a dugong as part of the world's largest dugong health check; a critical mission to help save the species globally; she learns that many dugong secrets can be found in their poo!

Head to Zambia's Liuwa Plain, where Steve tracks a young female cheetah that shows him how these supercharged cats hunt; learn what's pushing her species to the brink of extinction; hold your breath as bloodthirsty hyenas circle her territory.

The boys are in Laos in search of a diabolical catfish, but the best place to find it is near the mouth of Mekong, where it is believed that there is a hidden world. It is a difficult journey and the road is full of evil spirits.

Hope learns all she can from a birds of prey rehab.

Alaskans harness the power of the sun as they toil through summer.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

Alaskans harness the power of the sun as they toil through summer.

Gators, tortoises and stunning seabirds of southwest Florida.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Gators, tortoises and stunning seabirds of southwest Florida.

Ireland is small but epic in wonder; surrounded by the Atlantic Ocean, from the Cliffs of Moher to the extraordinary Giant's Causeway, this land has been shaped and reshaped by both the power of water and violent geological forces.

Zoom in on some otherworldly sights; spot a giant glacier on the Red Planet, let the milky seas off the coast of Java bathe your vision, ponder a huge hexagon floating above Saturn and take a spin around a doughnut-shaped lake in Saskatchewan.

Gators, tortoises and stunning seabirds of southwest Florida.

Alaskans must capitalize on the resources of the Arctic Summer.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

In the remote reaches of Asia's frozen north, creatures must overcome unique challenges, finding exceptional ways to thrive in a hostile world that pushes life to its very limits.

Alaskans must capitalize on the resources of the Arctic Summer.

In Moreton Bay, Dr. Ann gets in the water with a dugong as part of the world's largest dugong health check; a critical mission to help save the species globally; she learns that many dugong secrets can be found in their poo!

Head to Zambia's Liuwa Plain, where Steve tracks a young female cheetah that shows him how these supercharged cats hunt; learn what's pushing her species to the brink of extinction; hold your breath as bloodthirsty hyenas circle her territory.

Around 12,000 years ago, as the Ice Age finally thaws, humanity makes a dramatic shift - abandoning nomadic life for permanent settlements.

Cities are one humanity's greatest inventions, they bring people together and drive wealth, but as more of people flock to live and work in them, they have to become greener, more sustainable and efficient places to live.