At the very end of East Africa's Great Rift Valley, there's a "land that time forgot" ; the rolling grasslands of the Luangwa Valley.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

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

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

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

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Hope tries to stop the outbreak from spreading; decisions to save Hope for Wildlife.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Meandering through the black waters of a primordial river immortalized in a folk song.

Hope tries to stop the outbreak from spreading; decisions to save Hope for Wildlife.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

Meandering through the black waters of a primordial river immortalized in a folk song.

Hope tries to stop the outbreak from spreading; decisions to save Hope for Wildlife.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

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

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

Alaskans get a brief respite from winter's fury with the end of the thaw.

The team takes a risky detour through western China and Central Asia, where altitude sickness hits hard; the team reaches Kyrgyzstan and then brace for scares on the infamous Pamir Highway before the Rover limps into Turkmenistan.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Revealing what would be left if the planet was drained of its oceans.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Revealing what would be left if the planet was drained of its oceans.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

The team takes a risky detour through western China and Central Asia, where altitude sickness hits hard; the team reaches Kyrgyzstan and then brace for scares on the infamous Pamir Highway before the Rover limps into Turkmenistan.

Alaskans get a brief respite from winter's fury with the end of the thaw.

The coastline of Mozambique attracts some of the world's largest filter feeders; Two of Mozambique's leading marine researchers, Andrea Marshall and Nakia Cullain, set out to find one of the ocean's most secretive animals.

Savannah balances the medical needs of animals with the emotional bonds of the owners.

There's a new employee at Rocky Rapids Vet. Clinic, Dr. Dayle Poitras, a newly graduated Métis vet excited about landing her first full-time gig; Savannah is keen to mentor young Dayle while learning about what it means to be Métis.

Griff Rhys Jones begins his exploration of Ontario and ponders why Canadians are so nice.

The coastline of Mozambique attracts some of the world's largest filter feeders; Two of Mozambique's leading marine researchers, Andrea Marshall and Nakia Cullain, set out to find one of the ocean's most secretive animals.

Savannah balances the medical needs of animals with the emotional bonds of the owners.

There's a new employee at Rocky Rapids Vet. Clinic, Dr. Dayle Poitras, a newly graduated Métis vet excited about landing her first full-time gig; Savannah is keen to mentor young Dayle while learning about what it means to be Métis.

Griff Rhys Jones begins his exploration of Ontario and ponders why Canadians are so nice.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

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.

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

Alex taps Tim's grandson, Nat, to take over after his grandpa is hospitalized in Singapore; the dynamic duo coax the rattletrap Rover through Malaysia and Thailand, then into Myanmar.

Tim's old mate, Sithu, agrees to guide Alex and Nat through Myanmar, where civil unrest makes the route to India even more challenging.

The team takes a risky detour through western China and Central Asia, where altitude sickness hits hard; the team reaches Kyrgyzstan and then brace for scares on the infamous Pamir Highway before the Rover limps into Turkmenistan.

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

High in the mountains of Morocco lives a descendant of a long line of macaque rulers who has been in charge of her troupe for many winters - one of the longest recorded reigns of an alpha - but this year is likely to be her last.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

High in the mountains of Morocco lives a descendant of a long line of macaque rulers who has been in charge of her troupe for many winters - one of the longest recorded reigns of an alpha - but this year is likely to be her last.

Exploring powerful lightning, mountains with strange, metallic frosts and monsoon rains on a moon that is a billion miles away from Earth.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

High in the mountains of Morocco lives a descendant of a long line of macaque rulers who has been in charge of her troupe for many winters - one of the longest recorded reigns of an alpha - but this year is likely to be her last.

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Revealing what would be left if the planet was drained of its oceans.

Humpbacks and whale sharks visit the coast of Mozambique.

A field trip to do a bison herd check near her Métis homelands sheds more light on who Dr. Savannah is; she dives deeper into her identity as a Métis woman.

Dr. Savannah treats a hound after the poor pup is kicked in the head by a horse; she must also race against time to treat and return an injured fawn into the wild after a cougar attacked it.

British comedian and travel enthusiast Griff Rhys Jones explores the frozen wilds of Canada's north, in the province of Manitoba.

Humpbacks and whale sharks visit the coast of Mozambique.

A field trip to do a bison herd check near her Métis homelands sheds more light on who Dr. Savannah is; she dives deeper into her identity as a Métis woman.

Dr. Savannah treats a hound after the poor pup is kicked in the head by a horse; she must also race against time to treat and return an injured fawn into the wild after a cougar attacked it.

British comedian and travel enthusiast Griff Rhys Jones explores the frozen wilds of Canada's north, in the province of Manitoba.

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

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity; one where some form of alien life might even exist.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

Steve Backshall embarks on a mission to the steamy rainforests of Costa Rica; things get off to a breathtaking start when Steve is almost strangled by a giant boa constrictor.

Steve and his team travel to the pristine island of Borneo.

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 team takes a risky detour through western China and Central Asia, where altitude sickness hits hard; the team reaches Kyrgyzstan and then brace for scares on the infamous Pamir Highway before the Rover limps into Turkmenistan.

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.

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.

The team takes a risky detour through western China and Central Asia, where altitude sickness hits hard; the team reaches Kyrgyzstan and then brace for scares on the infamous Pamir Highway before the Rover limps into Turkmenistan.

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.

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.

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.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Alaskans get a brief respite from winter's fury with the end of the thaw.

A look at the care, cleaning and feeding of the animals; a patient refuses to leave.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

The best kept secrets of Nova Scotia.

A look at the care, cleaning and feeding of the animals; a patient refuses to leave.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

The best kept secrets of Nova Scotia.

A look at the care, cleaning and feeding of the animals; a patient refuses to leave.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Meeting the scientists, entrepreneurs, and tech wizards at the heart of the global metamorphosis of 5G; learning how blazing-fast wireless connections will transform home and work; getting a peek at futuristic devices and services.

In the planet's most densely populated continent, animals live at extremely close quarters with people, from tigers making a home in town to elephants stopping traffic for food.

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.

Steve heads to the Himalayas to visit the last great unexplored river in Bhutan, which, according to legend, drops off the face of the planet at some point.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

The team searches for a mechanic to resurrect the nearly dead Rover; they cross Azerbaijan, Georgia and Turkey before rejoining the original overland route and racing back to the UK for a tearful, joyous reunion at the finish line.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Meeting the scientists, entrepreneurs, and tech wizards at the heart of the global metamorphosis of 5G; learning how blazing-fast wireless connections will transform home and work; getting a peek at futuristic devices and services.

The team searches for a mechanic to resurrect the nearly dead Rover; they cross Azerbaijan, Georgia and Turkey before rejoining the original overland route and racing back to the UK for a tearful, joyous reunion at the finish line.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Hope says goodbye to two celebrated patients; the grim reality of wildlife rehabilitation.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Nova Scotia's Southern coast.

Hope says goodbye to two celebrated patients; the grim reality of wildlife rehabilitation.

The search for the building blocks of life on Mars; an attempt to prove life was, or is, possible on the red planet.

Nova Scotia's Southern coast.

Hope says goodbye to two celebrated patients; the grim reality of wildlife rehabilitation.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

Discovering how the moon shapes life on Earth.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

With heightened senses verging on superpowers, over two thirds of mammal species are creatures of the night with some even returning to the dark side as their daytime world gets more and more crowded.

In the Philippines, Steve has a tense and intimidating encounter with a living dinosaur; an arachnid with legs four times longer than its body; during an early morning dive, Steve sees a shark that spends most of the day 550 meters below the surface.

A race to find the planet's 60 deadliest creatures.

Steve dives in the shark capital of the world, meets hammerhead and tiger sharks nose to nose and passionately explains why sharks need friends.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

In the Philippines, Steve has a tense and intimidating encounter with a living dinosaur; an arachnid with legs four times longer than its body; during an early morning dive, Steve sees a shark that spends most of the day 550 meters below the surface.

A race to find the planet's 60 deadliest creatures.

Steve dives in the shark capital of the world, meets hammerhead and tiger sharks nose to nose and passionately explains why sharks need friends.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

Discovering how the moon shapes life on Earth.

With heightened senses verging on superpowers, over two thirds of mammal species are creatures of the night with some even returning to the dark side as their daytime world gets more and more crowded.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

Hope prepares for one of the most important days of the year; a violent storm threatens the event.

The Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

The Eastern Coastline is a living historical record of the battle between the French and English.

Hope prepares for one of the most important days of the year; a violent storm threatens the event.

The Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

The Eastern Coastline is a living historical record of the battle between the French and English.

Hope prepares for one of the most important days of the year; a violent storm threatens the event.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Brian explores the sun's rule over every world in the solar system.

In the Philippines, Steve has a tense and intimidating encounter with a living dinosaur; an arachnid with legs four times longer than its body; during an early morning dive, Steve sees a shark that spends most of the day 550 meters below the surface.

A race to find the planet's 60 deadliest creatures.

Steve dives in the shark capital of the world, meets hammerhead and tiger sharks nose to nose and passionately explains why sharks need friends.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Mammals have mastered every environment on Earth, but today the planet is changing rapidly, thanks to one mammal in particular; as humans reshape the planet, mammals must change with it and find surprising ways to survive this new wild.

David Attenborough explores his passion for birds' eggs. These remarkable structures nurture new life, protecting it from the outside world at the same time as allowing it to breathe.

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.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

David Attenborough explores his passion for birds' eggs. These remarkable structures nurture new life, protecting it from the outside world at the same time as allowing it to breathe.

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.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Brian explores the sun's rule over every world in the solar system.

Mammals have mastered every environment on Earth, but today the planet is changing rapidly, thanks to one mammal in particular; as humans reshape the planet, mammals must change with it and find surprising ways to survive this new wild.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Dr. Barry gets married; an eagle needs surgery; Hope releases the deer that arrived as fawns.

Scientists work to find ways to safeguard Earth from potential threats posed by asteroids and other cosmic debris.

A journey along the geological marvel that is the Bay of Fundy coastline.

Dr. Barry gets married; an eagle needs surgery; Hope releases the deer that arrived as fawns.

Scientists work to find ways to safeguard Earth from potential threats posed by asteroids and other cosmic debris.

A journey along the geological marvel that is the Bay of Fundy coastline.

Dr. Barry gets married; an eagle needs surgery; Hope releases the deer that arrived as fawns.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

David Attenborough explores his passion for birds' eggs. These remarkable structures nurture new life, protecting it from the outside world at the same time as allowing it to breathe.

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.

Journey from the lava ramparts to its fiery heart, discovering how this place became one of the most important areas of biodiversity in the world.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

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

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

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

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

Hope is taking on more animals and more responsibilities, but there are concerns about Hope's own health.

Scientists explore how to protect the earth when solar storms destroy earthbound technologies and send satellites crashing to earth.

Take a bird's-eye-view of Cape Breton Island; soar above from the Canso Causeway to the Cape Breton Highlands, and see the Cabot Trail.

Hope is taking on more animals and more responsibilities, but there are concerns about Hope's own health.

Scientists explore how to protect the earth when solar storms destroy earthbound technologies and send satellites crashing to earth.

Take a bird's-eye-view of Cape Breton Island; soar above from the Canso Causeway to the Cape Breton Highlands, and see the Cabot Trail.

Hope is taking on more animals and more responsibilities, but there are concerns about Hope's own health.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

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

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found ways to overcome the challenges of a life in water.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

An international team of volcanologists in Iceland.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

An international team of volcanologists in Iceland.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found ways to overcome the challenges of a life in water.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Plankton are the basis of the world's largest food web.

Dogs indeed account for more than half of the patients at Rocky Rapids Clinic; Dr. Savannah works tirelessly to keep rural Alberta's four-legged canine friends healthy and safe.

Pets need their owners to meet their basic needs, but humans can also gain an emotional benefit from their pets; Dr. Savannah explores the loving connection between humans and their pets when two of her longtime clients lose their beloved ferret.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

Plankton are the basis of the world's largest food web.

Dogs indeed account for more than half of the patients at Rocky Rapids Clinic; Dr. Savannah works tirelessly to keep rural Alberta's four-legged canine friends healthy and safe.

Pets need their owners to meet their basic needs, but humans can also gain an emotional benefit from their pets; Dr. Savannah explores the loving connection between humans and their pets when two of her longtime clients lose their beloved ferret.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

David Attenborough explores his passion for birds' eggs. These remarkable structures nurture new life, protecting it from the outside world at the same time as allowing it to breathe.

The team searches for a mechanic to resurrect the nearly dead Rover; they cross Azerbaijan, Georgia and Turkey before rejoining the original overland route and racing back to the UK for a tearful, joyous reunion at the finish line.

With heightened senses verging on superpowers, over two thirds of mammal species are creatures of the night with some even returning to the dark side as their daytime world gets more and more crowded.

Mammals have mastered every environment on Earth, but today the planet is changing rapidly, thanks to one mammal in particular; as humans reshape the planet, mammals must change with it and find surprising ways to survive this new wild.

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found ways to overcome the challenges of a life in water.

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

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

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

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

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

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

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

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

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

An international team of volcanologists in Iceland.

Two brilliant physicists, Albert Einstein and Stephen Hawking have each defined humanity's understanding of the universe but their beliefs on how it works do not always align.

The great white shark is one of the most iconic ocean creatures.

A journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the mountains to where the river meets the North Sea.

Dr. Savannah heads to Cambridge Bay, Nunavut in the far Arctic, to offer her expert services at a volunteer vet clinic; it's the only chance the residents will have all year to seek medical advice for their pets.

Variety is the spice of life for Dr. Savannah as every day presents a host of new changes, from inner-city wild bird rescues to performing an emergency c-section on a pregnant cow.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

The great white shark is one of the most iconic ocean creatures.

Dr. Savannah heads to Cambridge Bay, Nunavut in the far Arctic, to offer her expert services at a volunteer vet clinic; it's the only chance the residents will have all year to seek medical advice for their pets.

Variety is the spice of life for Dr. Savannah as every day presents a host of new changes, from inner-city wild bird rescues to performing an emergency c-section on a pregnant cow.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

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

Many leading scientists believe there's a possibility to soon detect the first evidence of extraterrestrial life.

An international team of volcanologists in Iceland.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Levison and Alberto explore a vampire bat-infested cave, the Panama Canal and modern Panama City.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

In the Philippines, Steve has a tense and intimidating encounter with a living dinosaur; an arachnid with legs four times longer than its body; during an early morning dive, Steve sees a shark that spends most of the day 550 meters below the surface.

Steve dives in the shark capital of the world, meets hammerhead and tiger sharks nose to nose and passionately explains why sharks need friends.