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.

The water bodies in Serengeti serve as a lifeline to many terrestrial, aerial and amphibious animals. Without them, the park's ecosystem cannot be considered whole.

Frozen water takes on a sharper persona, influencing everything in its path.

A look at the supercharged abilities that give some animals an edge in life; discovering fireflies' flirty flashes, the tarsier's incredible night vision, the mantis shrimp' knockout punch and the saltwater croc's prey-detecting pressure sensors.

The water bodies in Serengeti serve as a lifeline to many terrestrial, aerial and amphibious animals. Without them, the park's ecosystem cannot be considered whole.

Frozen water takes on a sharper persona, influencing everything in its path.

A look at the supercharged abilities that give some animals an edge in life; discovering fireflies' flirty flashes, the tarsier's incredible night vision, the mantis shrimp' knockout punch and the saltwater croc's prey-detecting pressure sensors.

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.

The water bodies in Serengeti serve as a lifeline to many terrestrial, aerial and amphibious animals. Without them, the park's ecosystem cannot be considered whole.

Frozen water takes on a sharper persona, influencing everything in its path.

A look at the supercharged abilities that give some animals an edge in life; discovering fireflies' flirty flashes, the tarsier's incredible night vision, the mantis shrimp' knockout punch and the saltwater croc's prey-detecting pressure sensors.

Follow the team in healing and releasing a grumpy sea turtle and then meet a sea lion with an unusual injury that must be taken by crane to the rescue center; find out how the vet aids an aging fruit bat and a community rescues a one-eyed seal pup.

Quetico Provincial Park pioneers forest fire strategies and faces a declining moose population.

The jewel of the Ontario parks system gives a muse to Tom Thompson and draws many researchers.

The worst winter in 100 years causes big problems.

Follow the team in healing and releasing a grumpy sea turtle and then meet a sea lion with an unusual injury that must be taken by crane to the rescue center; find out how the vet aids an aging fruit bat and a community rescues a one-eyed seal pup.

Quetico Provincial Park pioneers forest fire strategies and faces a declining moose population.

The jewel of the Ontario parks system gives a muse to Tom Thompson and draws many researchers.

An introduction to some of the big characters including "class clown" Valentino and "Big Boy" Beni; an emergency arrival of teenage mom Clara and her baby Clarita; vets round up the older orangutans, who are now ready to be released.

Follow the team in healing and releasing a grumpy sea turtle and then meet a sea lion with an unusual injury that must be taken by crane to the rescue center; find out how the vet aids an aging fruit bat and a community rescues a one-eyed seal pup.

Join anthropologist Jill Pruetz and guide Dondo "Johnny" Kanté and watch evolution happen in real time; meet the elusive chimps of Fongoli, Senegal, who use tools, interact with fire, and adapt to the human world as it collides with their own.

Elephants living in Tanzania.

Observe the fragile and evolving friendship between humans and elephants.

Two elephants journey from bondage and servitude to their new lives in Elephant Haven's forest, where they are able to begin their recovery and rehabilitation in the wild.

The water bodies in Serengeti serve as a lifeline to many terrestrial, aerial and amphibious animals. Without them, the park's ecosystem cannot be considered whole.

Frozen water takes on a sharper persona, influencing everything in its path.

A look at the supercharged abilities that give some animals an edge in life; discovering fireflies' flirty flashes, the tarsier's incredible night vision, the mantis shrimp' knockout punch and the saltwater croc's prey-detecting pressure sensors.

A look at the lives of elephant bulls in Mount Kilimanjaro and Amboseli, including their drive for dominance and the social bonds that form between males.

Take a deep dive to find out what bull sharks and great whites do after sunset.

Contemplate shark community hierarchies and discover how they socialize.

A look at the lives of elephant bulls in Mount Kilimanjaro and Amboseli, including their drive for dominance and the social bonds that form between males.

Take a deep dive to find out what bull sharks and great whites do after sunset.

Contemplate shark community hierarchies and discover how they socialize.

An introduction to some of the big characters including "class clown" Valentino and "Big Boy" Beni; an emergency arrival of teenage mom Clara and her baby Clarita; vets round up the older orangutans, who are now ready to be released.

A look at the lives of elephant bulls in Mount Kilimanjaro and Amboseli, including their drive for dominance and the social bonds that form between males.

Take a deep dive to find out what bull sharks and great whites do after sunset.

Contemplate shark community hierarchies and discover how they socialize.

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.

Determining the effect of global warming on the park's glaciers and wolverine population.

A healthy bison population is threatened by where they eat.

A hare needs help; Chelsea rescues a litter of orphaned foxes; Dr. Barry helps an injured bobcat.

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.

Determining the effect of global warming on the park's glaciers and wolverine population.

A healthy bison population is threatened by where they eat.

"Class Clown" Valentino is busy showing off; the staff decide that "Big Boy" Beni needs to lose weight; teenage mom Clara and her baby Clarita face a return to island life; they welcome a new pupil: Alba, the only reported albino orangutan.

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.

Fraser Island is the largest sand island on Earth and a UNESCO World Heritage Site.

Human influence and effect on the beaches of California.

Descend into the tide pool, where a hermit crab house hunts; a baby catshark runs into strange neighbors; an octopus terrorizes prey; watch seagulls and other creatures hunt on the surface as the heat rises and oxygen depletes in the pool.

The sun sets and predators prowl around the pool before the tide finally rolls in; persevere as night falls with a kleptomaniacal slug and an acrobatic scallop; a pair of sneaky crabs take a dangerous shot at romance.

A look at the lives of elephant bulls in Mount Kilimanjaro and Amboseli, including their drive for dominance and the social bonds that form between males.

Take a deep dive to find out what bull sharks and great whites do after sunset.

Contemplate shark community hierarchies and discover how they socialize.

Piglets growing up in the Brecon Beacons are followed for their first 12 weeks, and the theory that every piglet always returns to the same teat to suckle is tested.

Hippos, elephants, lions and buffalo are drawn to the Zambezi's wild waters, which grow from a tiny trickle in Zambia to the thundering Victoria Falls.

Navigating the harsh Mongolian wilderness with Dan O'Neill as he searches for the Dude, the largest snow leopard ever recorded.

Piglets growing up in the Brecon Beacons are followed for their first 12 weeks, and the theory that every piglet always returns to the same teat to suckle is tested.

Hippos, elephants, lions and buffalo are drawn to the Zambezi's wild waters, which grow from a tiny trickle in Zambia to the thundering Victoria Falls.

Navigating the harsh Mongolian wilderness with Dan O'Neill as he searches for the Dude, the largest snow leopard ever recorded.

"Class Clown" Valentino is busy showing off; the staff decide that "Big Boy" Beni needs to lose weight; teenage mom Clara and her baby Clarita face a return to island life; they welcome a new pupil: Alba, the only reported albino orangutan.

Piglets growing up in the Brecon Beacons are followed for their first 12 weeks, and the theory that every piglet always returns to the same teat to suckle is tested.

Hippos, elephants, lions and buffalo are drawn to the Zambezi's wild waters, which grow from a tiny trickle in Zambia to the thundering Victoria Falls.

Navigating the harsh Mongolian wilderness with Dan O'Neill as he searches for the Dude, the largest snow leopard ever recorded.

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.

Feeding a Giant Panda cub named Bao Bao.

Feeding a pride of adolescent lions.

Hope's team build a special flight tent for a lone bat; a young porcupine arrives at the rehab; a stranded seal is rescued.

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.

Feeding a Giant Panda cub named Bao Bao.

Feeding a pride of adolescent lions.

Kasper, who is 90kgs, somehow eludes the capture team and climbs 30 meters high in a tree; Beni's food theft and ongoing weight gain starts causing serious concern for his health.

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.

A family of wild dogs living in a corner of Zambia's Luangwa Valley.

Spotty the hyena must ascend to the leadership of the Chimbwe Clan in Zambia's Luangwa Valley.

Explore community-run Reteti Elephant Sanctuary, where human surrogate moms offer survival lessons and nurture young elephants through play; bonding with trunkless Long'uro and seeing why Kelele's mysterious illness could delay his release.

Balance the pain of goodbyes with hope for the future as a generation of rescued elephants is finally released.

Piglets growing up in the Brecon Beacons are followed for their first 12 weeks, and the theory that every piglet always returns to the same teat to suckle is tested.

Hippos, elephants, lions and buffalo are drawn to the Zambezi's wild waters, which grow from a tiny trickle in Zambia to the thundering Victoria Falls.

Navigating the harsh Mongolian wilderness with Dan O'Neill as he searches for the Dude, the largest snow leopard ever recorded.