Wallabies, koolamana lizards and crocodile hatchlings face the wild river's dangers.

South Cuba's remarkable coral reefs have been unexplored for over 50 years.

Over the course of evolution, the leopard has adapted to the hot climate and developed a number of survival techniques.

After weeks of battling a mysterious head infection, Erik joins the group two students; at forest school, the group three students enjoy a poolside classroom where Valentino proves he's more than just a class clown.

Wallabies, koolamana lizards and crocodile hatchlings face the wild river's dangers.

South Cuba's remarkable coral reefs have been unexplored for over 50 years.

Over the course of evolution, the leopard has adapted to the hot climate and developed a number of survival techniques.

Wildlife in the forest depends on a delicate balance of growth and destruction.

Riding Mountain National Park in Manitoba.

Fundy National Park in southern New Brunswick.

Busier than ever, Hope and the team struggle to handle the huge caseload; a volunteer helps an injured bird.

Wildlife in the forest depends on a delicate balance of growth and destruction.

Riding Mountain National Park in Manitoba.

Fundy National Park in southern New Brunswick.

Young orangutans who have lost their mothers to poaching and deforestation learn the skills they'll need to survive in the wild at a unique forest school.

Wildlife in the forest depends on a delicate balance of growth and destruction.

Professor Ben Garrod explores the evolution of the body's largest organ, skin.

Skin has evolved to enable animals to move through a range of habitats.

Skin is the external barrier between animals and the outside world.

The unlikely collaborators working to ensure mutual survival in the Kalahari Basin; an elephant clan's symbiotic link to fruiting anaboom trees, a meerkat's alliance with a feisty drongo bird, and more flora-and-fauna odd couples.

Wallabies, koolamana lizards and crocodile hatchlings face the wild river's dangers.

South Cuba's remarkable coral reefs have been unexplored for over 50 years.

Over the course of evolution, the leopard has adapted to the hot climate and developed a number of survival techniques.

Extraordinary photography reveals the hidden senses and secret communication skills of animals.

Big cat expert Giles Clark adopts jaguar cub Maya and hand-raises her at home while raising funds for wild cats; Giles has his hands full, improving the lives of the fifty cats that live there.

A majestic Asian elephant who survived a catastrophic flood at his zoo in Tbilisi, Georgia has a badly infected tusk; surgeons race to remove the tusk and save the gentle giant's life.

Extraordinary photography reveals the hidden senses and secret communication skills of animals.

Big cat expert Giles Clark adopts jaguar cub Maya and hand-raises her at home while raising funds for wild cats; Giles has his hands full, improving the lives of the fifty cats that live there.

A majestic Asian elephant who survived a catastrophic flood at his zoo in Tbilisi, Georgia has a badly infected tusk; surgeons race to remove the tusk and save the gentle giant's life.

Young orangutans who have lost their mothers to poaching and deforestation learn the skills they'll need to survive in the wild at a unique forest school.

Extraordinary photography reveals the hidden senses and secret communication skills of animals.

Big cat expert Giles Clark adopts jaguar cub Maya and hand-raises her at home while raising funds for wild cats; Giles has his hands full, improving the lives of the fifty cats that live there.

A majestic Asian elephant who survived a catastrophic flood at his zoo in Tbilisi, Georgia has a badly infected tusk; surgeons race to remove the tusk and save the gentle giant's life.

Many species survive by living in groups.

Terra Nova National Park on the Newfoundland coast is a beautiful enigma with a rugged forest.

Quttinirpaaq National Park is affected by climate change.

Starting up a raccoon adoption agency; Hope tries to make peace between wild enemies; a kidnapped fawn needs to be reunited with its mother.

Many species survive by living in groups.

Terra Nova National Park on the Newfoundland coast is a beautiful enigma with a rugged forest.

Quttinirpaaq National Park is affected by climate change.

Young orangutans who have lost their mothers to poaching and deforestation learn the skills they'll need to survive in the wild at a unique forest school.

Many species survive by living in groups.

Rising sea levels threaten the small island nation of the Maldives.

Sharks are at risk in Costa Rica.

Meeting a lovey-dovey penguin, a flamingo makeup artist and a badger making great escapes.

Attending a crabby shell swap, meeting a chimp's pet and sizing up an otter kidnapper.

Extraordinary photography reveals the hidden senses and secret communication skills of animals.

Big cat expert Giles Clark adopts jaguar cub Maya and hand-raises her at home while raising funds for wild cats; Giles has his hands full, improving the lives of the fifty cats that live there.

A majestic Asian elephant who survived a catastrophic flood at his zoo in Tbilisi, Georgia has a badly infected tusk; surgeons race to remove the tusk and save the gentle giant's life.

Sharks often get portrayed as mindless predators prone to attacking humans, but there is more to these graceful apex predators than meets the eye; the Bimini Sharklab undertakes novel research into shark intelligence.

Stage one of the competition kicks off with seven ravenous bears post-hibernation; tiny Stomper vies for power and Blondie's love, grizzled vet Bernie brawls with clueless teen Casanova and new mom BoldFace battles wolves.

The Stage 1 winners and some tough new recruits dash to cash on July's salmon feast; BigBoi embarks on a food-finding road trip, QuadMom and RedBack are welcomed to the feast and BoldFace keeps her surviving cub safe.

Sharks often get portrayed as mindless predators prone to attacking humans, but there is more to these graceful apex predators than meets the eye; the Bimini Sharklab undertakes novel research into shark intelligence.

Stage one of the competition kicks off with seven ravenous bears post-hibernation; tiny Stomper vies for power and Blondie's love, grizzled vet Bernie brawls with clueless teen Casanova and new mom BoldFace battles wolves.

The Stage 1 winners and some tough new recruits dash to cash on July's salmon feast; BigBoi embarks on a food-finding road trip, QuadMom and RedBack are welcomed to the feast and BoldFace keeps her surviving cub safe.

Young orangutans who have lost their mothers to poaching and deforestation learn the skills they'll need to survive in the wild at a unique forest school.

Sharks often get portrayed as mindless predators prone to attacking humans, but there is more to these graceful apex predators than meets the eye; the Bimini Sharklab undertakes novel research into shark intelligence.

Stage one of the competition kicks off with seven ravenous bears post-hibernation; tiny Stomper vies for power and Blondie's love, grizzled vet Bernie brawls with clueless teen Casanova and new mom BoldFace battles wolves.

The Stage 1 winners and some tough new recruits dash to cash on July's salmon feast; BigBoi embarks on a food-finding road trip, QuadMom and RedBack are welcomed to the feast and BoldFace keeps her surviving cub safe.

Jean Du Plessis takes a trip through the Serengeti with migrating wildebeest.

Visitors from around the world come to La Maurice National Park each fall when the leaves change.

The Gulf Island National Park sits between the development of Vancouver Island and British Columbia.

A new volunteer steps up to the challenge; Hope's first fawn of the year interrupts delicate surgery on an injured owl.

Jean Du Plessis takes a trip through the Serengeti with migrating wildebeest.

Visitors from around the world come to La Maurice National Park each fall when the leaves change.

The Gulf Island National Park sits between the development of Vancouver Island and British Columbia.

The fate of several graduates awaits the next round of wild releases; runaway Zalipa is found, but her partner in crime, Tulia, is still missing; baby Clarita has a complete meltdown as the vets perform surgery on her mother.

Jean Du Plessis takes a trip through the Serengeti with migrating wildebeest.

Only seven percent of the Great Barrier Reef is coral and the remainder is a variety of interconnected habitats including the world's oldest jungle, hundreds of islands, mangrove swamps, deep water gardens, sand flats and sea grass.

Creatures travel thousands of miles to visit the reef and Pacific weather patterns are likely to further shape the terrain and wildlife.

A journey across Madagascar uncovers the unique and incredible wildlife it has to offer, from its famed lemurs to chameleons.

Twice the size of the British Isles, Borneo is the third largest island on Earth and home to possibly the greatest diversity of life of any island, from flying lizards sun bears to orangutans.

Sharks often get portrayed as mindless predators prone to attacking humans, but there is more to these graceful apex predators than meets the eye; the Bimini Sharklab undertakes novel research into shark intelligence.

Stage one of the competition kicks off with seven ravenous bears post-hibernation; tiny Stomper vies for power and Blondie's love, grizzled vet Bernie brawls with clueless teen Casanova and new mom BoldFace battles wolves.

The Stage 1 winners and some tough new recruits dash to cash on July's salmon feast; BigBoi embarks on a food-finding road trip, QuadMom and RedBack are welcomed to the feast and BoldFace keeps her surviving cub safe.

Geographical extremities and hungry predators make it impossible for the migrating herds to avoid casualties. But no matter what happens, the journey must go on.

Swamps, with the duality of life and death, nurture young and trap lost souls.

Discover how weirdness is baked into some animals' DNA from birth; check out the bowerbird's mate-attracting dance moves, the Christmas Island crab's traffic-dodging prowess and the sockeye salmon's uphill swimming skills!

Geographical extremities and hungry predators make it impossible for the migrating herds to avoid casualties. But no matter what happens, the journey must go on.

Swamps, with the duality of life and death, nurture young and trap lost souls.

Discover how weirdness is baked into some animals' DNA from birth; check out the bowerbird's mate-attracting dance moves, the Christmas Island crab's traffic-dodging prowess and the sockeye salmon's uphill swimming skills!

The fate of several graduates awaits the next round of wild releases; runaway Zalipa is found, but her partner in crime, Tulia, is still missing; baby Clarita has a complete meltdown as the vets perform surgery on her mother.

Geographical extremities and hungry predators make it impossible for the migrating herds to avoid casualties. But no matter what happens, the journey must go on.

Swamps, with the duality of life and death, nurture young and trap lost souls.

Discover how weirdness is baked into some animals' DNA from birth; check out the bowerbird's mate-attracting dance moves, the Christmas Island crab's traffic-dodging prowess and the sockeye salmon's uphill swimming skills!

Jean witnesses how infant calves fare against the predatorial lions and crocodiles of the Mara.

The remote Auyuittuq National Park is home to polar bears, glaciers and Mount Thor.

Some of the most lush and remote landscapes on the continent are preserved in the Gwaii Haanas National Park Reserve.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

Jean witnesses how infant calves fare against the predatorial lions and crocodiles of the Mara.

The remote Auyuittuq National Park is home to polar bears, glaciers and Mount Thor.

Some of the most lush and remote landscapes on the continent are preserved in the Gwaii Haanas National Park Reserve.

The team makes the final attempt to reunite reluctant mother Dilla with her new baby Delilah; Clara and Clarita are on their final journey to freedom when a dangerous flood stops them in their tracks and threatens everyone.

Jean witnesses how infant calves fare against the predatorial lions and crocodiles of the Mara.

Hawaii is the most remote island chain on Earth, and its shores are hard to reach. But for the hardy creatures that can make it here, like the waterfall climbing fish, carnivorous caterpillar and Laysan albatross, a land of opportunity awaits.

A new awareness of nature helps to restore ecosystems from Panama to Mozambique; repairing man-made damage and restoring reefs, rivers and animal populations.

Scientists, citizens and activists restore the environment thanks to a new understanding of nature.

Why restoring nature may be the best hope for fighting climate change and slowing down global warming.

Geographical extremities and hungry predators make it impossible for the migrating herds to avoid casualties. But no matter what happens, the journey must go on.

Swamps, with the duality of life and death, nurture young and trap lost souls.

Discover how weirdness is baked into some animals' DNA from birth; check out the bowerbird's mate-attracting dance moves, the Christmas Island crab's traffic-dodging prowess and the sockeye salmon's uphill swimming skills!

Experts examine whether female or male sharks are more dominant, testing jumping, boldness and strength in a series of challenges.

Go on a risky tagging mission and get a 360-degree view of feeding hot spots.

Hunt for signs of mating sharks and get a peek at their hidden pupping grounds.

Experts examine whether female or male sharks are more dominant, testing jumping, boldness and strength in a series of challenges.

Go on a risky tagging mission and get a 360-degree view of feeding hot spots.

Hunt for signs of mating sharks and get a peek at their hidden pupping grounds.

The team makes the final attempt to reunite reluctant mother Dilla with her new baby Delilah; Clara and Clarita are on their final journey to freedom when a dangerous flood stops them in their tracks and threatens everyone.

Experts examine whether female or male sharks are more dominant, testing jumping, boldness and strength in a series of challenges.

Go on a risky tagging mission and get a 360-degree view of feeding hot spots.

Hunt for signs of mating sharks and get a peek at their hidden pupping grounds.

Jean visits Tanzania's Ngorongoro Crater, home to the highest concentration of mammals in the world.

Waterton National Park's location makes it one of the best spots on earth to spot wildlife.

One of the world's largest polar bear denning sites hosts both tundra and marine environments.

The rehab is up all night with three tiny orphans needing round-the-clock care.

Jean visits Tanzania's Ngorongoro Crater, home to the highest concentration of mammals in the world.

Waterton National Park's location makes it one of the best spots on earth to spot wildlife.

One of the world's largest polar bear denning sites hosts both tundra and marine environments.

An inside look at the Nyaru Menteng Rescue Center in Borneo to explore how the orangutan school curriculum works, from nursery through graduation.

Jean visits Tanzania's Ngorongoro Crater, home to the highest concentration of mammals in the world.

Florida has the most tidal shoreline in the contiguous United States.

Nova Scotia beaches prove a beach needs a balance between opposing forces to thrive.

The mythology of Ixchel, a protective mother figure.

Hawaiian beaches are created and altered by active volcanoes.

Experts examine whether female or male sharks are more dominant, testing jumping, boldness and strength in a series of challenges.

Go on a risky tagging mission and get a 360-degree view of feeding hot spots.

Hunt for signs of mating sharks and get a peek at their hidden pupping grounds.

Seven daredevil filmmakers try to capture a shark shot; see the preparation and planning that goes into achieving the desired footage.

The Mississippi, from frozen waterfalls to time-traveling barges, from busy beavers to mysterious swamps, connects a continent like no other river. At the end of its 3,500-mile journey, it creates one of the biggest river deltas on the planet.

Navigating the harsh Mongolian wilderness with Dan as he searches for The Dude, the largest snow leopard ever recorded; he battles hostile landscapes and uncertainty as he sheds light on the challenges that The Dude and other snow leopards face.

Seven daredevil filmmakers try to capture a shark shot; see the preparation and planning that goes into achieving the desired footage.

The Mississippi, from frozen waterfalls to time-traveling barges, from busy beavers to mysterious swamps, connects a continent like no other river. At the end of its 3,500-mile journey, it creates one of the biggest river deltas on the planet.

Navigating the harsh Mongolian wilderness with Dan as he searches for The Dude, the largest snow leopard ever recorded; he battles hostile landscapes and uncertainty as he sheds light on the challenges that The Dude and other snow leopards face.

An inside look at the Nyaru Menteng Rescue Center in Borneo to explore how the orangutan school curriculum works, from nursery through graduation.

Seven daredevil filmmakers try to capture a shark shot; see the preparation and planning that goes into achieving the desired footage.

The Mississippi, from frozen waterfalls to time-traveling barges, from busy beavers to mysterious swamps, connects a continent like no other river. At the end of its 3,500-mile journey, it creates one of the biggest river deltas on the planet.

Navigating the harsh Mongolian wilderness with Dan as he searches for The Dude, the largest snow leopard ever recorded; he battles hostile landscapes and uncertainty as he sheds light on the challenges that The Dude and other snow leopards face.

Jean climbs through Mount Killimanjaro's five different climates.

Visitors to Nahanni National Park can see striking waterfalls, mountain peaks and canyons.

The scattered terrain of St. Lawrence Islands.

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

Jean climbs through Mount Killimanjaro's five different climates.

Visitors to Nahanni National Park can see striking waterfalls, mountain peaks and canyons.

The scattered terrain of St. Lawrence Islands.

The orphaned orangutans attempt to make friends, which is a vital step in rehabilitation.

Jean climbs through Mount Killimanjaro's five different climates.

A female leopard named Olimba in Zambia's Luangwa Valley.

Dreamer, a tiger cub, forms a new friendship with the adolescent Misfit. The two unlikely friends work together to survive the hardships ahead.

Twin male lions have ruled the Nsefu Pride for three years.

Mizumu, a male hyena, searches for a new clan.

Seven daredevil filmmakers try to capture a shark shot; see the preparation and planning that goes into achieving the desired footage.

The Mississippi, from frozen waterfalls to time-traveling barges, from busy beavers to mysterious swamps, connects a continent like no other river. At the end of its 3,500-mile journey, it creates one of the biggest river deltas on the planet.

Navigating the harsh Mongolian wilderness with Dan as he searches for The Dude, the largest snow leopard ever recorded; he battles hostile landscapes and uncertainty as he sheds light on the challenges that The Dude and other snow leopards face.

Wildlife filmmaker Gordon Buchanan gets close to wild cheetah in the Kalahari, experiencing first-hand the very real dangers these big cats face.

Tending to a spring rush and a rude roo.

Aiding a pelican in peril and a mad koala.

Wildlife filmmaker Gordon Buchanan gets close to wild cheetah in the Kalahari, experiencing first-hand the very real dangers these big cats face.

Tending to a spring rush and a rude roo.

Aiding a pelican in peril and a mad koala.

The orphaned orangutans attempt to make friends, which is a vital step in rehabilitation.

Wildlife filmmaker Gordon Buchanan gets close to wild cheetah in the Kalahari, experiencing first-hand the very real dangers these big cats face.

Tending to a spring rush and a rude roo.

Aiding a pelican in peril and a mad koala.

Jean meets the inhabitants of the Serengeti.

Yoho National Park, on the western slopes of the Rocky Mountains, has more than 250 miles of hiking trails.

This arctic land offers caribou, bears and wolves roaming among canyon vistas.

Two tricky patients finally go free; 50 babies are born all at once.

Jean meets the inhabitants of the Serengeti.

Yoho National Park, on the western slopes of the Rocky Mountains, has more than 250 miles of hiking trails.

This arctic land offers caribou, bears and wolves roaming among canyon vistas.

Food-obsessed Beni receives an educational lesson from the local dominant male Petruk; Spanser, a former illegal pet, attempts to control his sweet tooth.

Jean meets the inhabitants of the Serengeti.

Lady Elliot Island is the southern-most of the Great Barrier Reef.

Many iconic mainland fauna also live on Kangaroo Island.

Christmas Island is home to plants and creatures found nowhere else in the world.

Fraser Island is the largest sand island on Earth and home to many creatures.

Wildlife filmmaker Gordon Buchanan gets close to wild cheetah in the Kalahari, experiencing first-hand the very real dangers these big cats face.

Tending to a spring rush and a rude roo.

Aiding a pelican in peril and a mad koala.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

A shark scientist explores the mysteries of the hammerhead shark, using technology in the form of a remote-controlled stingray to learn more about the huge deepwater predators off the small island of Bimini.

Stories of how animals react to Earth's extremes, from humpback whales to tiny butterflies and savanna chimpanzees.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

A shark scientist explores the mysteries of the hammerhead shark, using technology in the form of a remote-controlled stingray to learn more about the huge deepwater predators off the small island of Bimini.

Stories of how animals react to Earth's extremes, from humpback whales to tiny butterflies and savanna chimpanzees.

Food-obsessed Beni receives an educational lesson from the local dominant male Petruk; Spanser, a former illegal pet, attempts to control his sweet tooth.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

A shark scientist explores the mysteries of the hammerhead shark, using technology in the form of a remote-controlled stingray to learn more about the huge deepwater predators off the small island of Bimini.

Stories of how animals react to Earth's extremes, from humpback whales to tiny butterflies and savanna chimpanzees.

Jean meets the inhabitants of the Serengeti.

Exploring the only island park in the Canadian Maritimes.

Canada's largest national park.

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

Jean meets the inhabitants of the Serengeti.

Exploring the only island park in the Canadian Maritimes.

Canada's largest national park.

Going up against infant Cesia's case of malaria and spotting a thief in the food store.

Jean meets the inhabitants of the Serengeti.

Thirst for rain alongside the animals of the Kalahari as elephant herds cooperate, and meerkat's adopt a strange babysitter in the depths of a brutally dry year.

Track scientists arrive in the Kalahari to test the hypothesis that animal collaboration is the key to the dizzying diversity of the region's species; they monitor behavior, decipher data, and deliver conclusions.

Shipwrecks in the Caribbean become artificial reefs that support marine life.

The waters near the Florida Keys are home to as many as 1,000 shipwrecks.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

A shark scientist explores the mysteries of the hammerhead shark, using technology in the form of a remote-controlled stingray to learn more about the huge deepwater predators off the small island of Bimini.

Stories of how animals react to Earth's extremes, from humpback whales to tiny butterflies and savanna chimpanzees.

The team investigates which foods are best for pets, demonstrates what can be done to save an injured animal and witnesses a pioneering operation that could save thousands of cats across the country.

Maya grows up to be seven weeks old and is becoming determined and vocal; Giles feels overwhelmed about the enormity of what he has taken on with the sanctuary, but is paying close attention to Maya's health, in particular her eyesight.

RSPCA vets treat a mother and baby koala, while rescuers capture a barn owl.

The team investigates which foods are best for pets, demonstrates what can be done to save an injured animal and witnesses a pioneering operation that could save thousands of cats across the country.

Maya grows up to be seven weeks old and is becoming determined and vocal; Giles feels overwhelmed about the enormity of what he has taken on with the sanctuary, but is paying close attention to Maya's health, in particular her eyesight.

RSPCA vets treat a mother and baby koala, while rescuers capture a barn owl.

Going up against infant Cesia's case of malaria and spotting a thief in the food store.

The team investigates which foods are best for pets, demonstrates what can be done to save an injured animal and witnesses a pioneering operation that could save thousands of cats across the country.

Maya grows up to be seven weeks old and is becoming determined and vocal; Giles feels overwhelmed about the enormity of what he has taken on with the sanctuary, but is paying close attention to Maya's health, in particular her eyesight.

RSPCA vets treat a mother and baby koala, while rescuers capture a barn owl.

The team saves a massive sea lion caught in a plastic noose; a visit to the Rescue Centre where a harbor seal pup may lose its eyesight; a baby sea otter needs a risky but life-saving surgery.

Pukaskwa's unpredictable landscape features boreal forests and iron-rich plutonic rocks.

Mingan Archipelago, along the St. Lawrence River, is composed of 30 limestone islands and more than 1,0000 islets.

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

The team saves a massive sea lion caught in a plastic noose; a visit to the Rescue Centre where a harbor seal pup may lose its eyesight; a baby sea otter needs a risky but life-saving surgery.

Pukaskwa's unpredictable landscape features boreal forests and iron-rich plutonic rocks.

Mingan Archipelago, along the St. Lawrence River, is composed of 30 limestone islands and more than 1,0000 islets.

Tracking down Lahei, who's gone AWOL; seeing who earns their post-college freedom.

The team saves a massive sea lion caught in a plastic noose; a visit to the Rescue Centre where a harbor seal pup may lose its eyesight; a baby sea otter needs a risky but life-saving surgery.

Boning up on desert eats; flirting with lions; witnessing an elephant babysitters' club.

Stealing meals with frigate birds; visiting a warthog spa; cracking an elephant code.

It takes a village to raise lion cubs in Kenya; sniff out the mating strategy of fragrant lemurs in Madagascar; cutting a rug at a honeybee dance party; a forked-tailed drongo tricks other birds out of their dinner.

The toothy fish that help sharks maintain their pearly whites; the signature calls of dolphin families; the capuchin monkey's nut-cracking stone tools; snuggling giraffes; a meerkat mobster.

The team investigates which foods are best for pets, demonstrates what can be done to save an injured animal and witnesses a pioneering operation that could save thousands of cats across the country.

Maya grows up to be seven weeks old and is becoming determined and vocal; Giles feels overwhelmed about the enormity of what he has taken on with the sanctuary, but is paying close attention to Maya's health, in particular her eyesight.

RSPCA vets treat a mother and baby koala, while rescuers capture a barn owl.

The ultimate battle for dominance as scientists try to pick out the alpha male in a pack of 100-plus great white sharks off the New Zealand coast.

An icy October storm complicates the race to the finish line; Big Boi bounces after a stumble before tragedy hits QuadMom; fan fave BoldFace hits her stride despite her clingy kid, Raccoon.

Unraveling the secrets of the most extreme sleepers of the animal kingdom; answering why and how animals sleep, how they deal with sleep deprivation and if animals dream.

The ultimate battle for dominance as scientists try to pick out the alpha male in a pack of 100-plus great white sharks off the New Zealand coast.

An icy October storm complicates the race to the finish line; Big Boi bounces after a stumble before tragedy hits QuadMom; fan fave BoldFace hits her stride despite her clingy kid, Raccoon.

Unraveling the secrets of the most extreme sleepers of the animal kingdom; answering why and how animals sleep, how they deal with sleep deprivation and if animals dream.

Tracking down Lahei, who's gone AWOL; seeing who earns their post-college freedom.

The ultimate battle for dominance as scientists try to pick out the alpha male in a pack of 100-plus great white sharks off the New Zealand coast.

An icy October storm complicates the race to the finish line; Big Boi bounces after a stumble before tragedy hits QuadMom; fan fave BoldFace hits her stride despite her clingy kid, Raccoon.

Unraveling the secrets of the most extreme sleepers of the animal kingdom; answering why and how animals sleep, how they deal with sleep deprivation and if animals dream.

Battling wind and waves to find a sea lion trapped in a plastic ring; visiting a rescue centre, where over 80 orphan seals must be fed several times a day to prepare for release into the wild; an Amazonian duck gets a miraculous operation.

Killarney Provincial Park acted as a battleground early in the environmental movement.

Nanabijou's trails may affect dear, wolf, and moose populations.

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

Battling wind and waves to find a sea lion trapped in a plastic ring; visiting a rescue centre, where over 80 orphan seals must be fed several times a day to prepare for release into the wild; an Amazonian duck gets a miraculous operation.

Killarney Provincial Park acted as a battleground early in the environmental movement.

Nanabijou's trails may affect dear, wolf, and moose populations.

Congratulating the new Orangutan Jungle School graduates, who aren't all spring chickens; following the convoy to the release site, where the team bids their friends a poignant farewell; enjoying the celebrations as Molly and Bumi move up a grade.

Battling wind and waves to find a sea lion trapped in a plastic ring; visiting a rescue centre, where over 80 orphan seals must be fed several times a day to prepare for release into the wild; an Amazonian duck gets a miraculous operation.

Penguin populations of Australia.

A look into the lives of emus.

A look at various airborne hunters.

An in-depth look at the elaborate and flamboyant mating rituals of various birds, including the prehistoric-looking cassowary and the male Victoria's riflebird.

The ultimate battle for dominance as scientists try to pick out the alpha male in a pack of 100-plus great white sharks off the New Zealand coast.

An icy October storm complicates the race to the finish line; Big Boi bounces after a stumble before tragedy hits QuadMom; fan fave BoldFace hits her stride despite her clingy kid, Raccoon.

Unraveling the secrets of the most extreme sleepers of the animal kingdom; answering why and how animals sleep, how they deal with sleep deprivation and if animals dream.