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.

Five desert lions come of age in the African Namib.

Soothing a bitten koala and itchy possums.

Tackling pet hoarding and a deadly snake.

Five desert lions come of age in the African Namib.

Soothing a bitten koala and itchy possums.

Tackling pet hoarding and a deadly snake.

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.

Five desert lions come of age in the African Namib.

Soothing a bitten koala and itchy possums.

Tackling pet hoarding and a deadly snake.

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.

Behind the scenes of North America's largest zoo kitchen.

The National Zoo feeds its animals by growing their own food.

A seal contracts a mysterious illness.

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.

Behind the scenes of North America's largest zoo kitchen.

The National Zoo feeds its animals by growing their own food.

Valentino, Yutris and the rest of group two have fun as they visit group three's flooded classroom; three quarantine infants get the results of their TB tests; the residents of Bangamat Island do not welcome newcomers leading to a confrontation.

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.

An illustration of how the Arctic springs to life after nearly seven months in total darkness.

Devon Island in Nunavut is the largest uninhabited island in the world; the icy landscape is so barren that NASA uses it to simulate conditions on Mars.

Inside the Mackenzie Delta, a transition zone of the boreal forest to the frozen tundra.

The people of Nunavik prepare for the coming winter.

Five desert lions come of age in the African Namib.

Soothing a bitten koala and itchy possums.

Tackling pet hoarding and a deadly snake.

Exploring ancient fire traditions and a sugar glider's daring escape from the flames.

Some of the most amazing hippo behavior happens after dark.

From the Galápagos Islands to the edge of Antarctica, island wildlife reveal insights into the rapidly changing planet.

Exploring ancient fire traditions and a sugar glider's daring escape from the flames.

Some of the most amazing hippo behavior happens after dark.

From the Galápagos Islands to the edge of Antarctica, island wildlife reveal insights into the rapidly changing planet.

Valentino, Yutris and the rest of group two have fun as they visit group three's flooded classroom; three quarantine infants get the results of their TB tests; the residents of Bangamat Island do not welcome newcomers leading to a confrontation.

Exploring ancient fire traditions and a sugar glider's daring escape from the flames.

Some of the most amazing hippo behavior happens after dark.

From the Galápagos Islands to the edge of Antarctica, island wildlife reveal insights into the rapidly changing planet.

Get to know Winston, a tiny abandoned cub who imprints on Judy as she nurses him 24-7.

Food acts as an important way for animals to keep busy, happy and healthy.

A herd of elephants from the Calgary Zoo arrive at the National Zoo in Washington D.C.

Many fawns are in need of help.

Get to know Winston, a tiny abandoned cub who imprints on Judy as she nurses him 24-7.

Food acts as an important way for animals to keep busy, happy and healthy.

A herd of elephants from the Calgary Zoo arrive at the National Zoo in Washington D.C.

Moving day arrives for the nursery school kids; Beni gets a beating from a bully; the socialization cage has a new queen; dominant male Pujon is still on a time-out after attacking Alba, but he's allowed a second chance to bond with his rival.

Get to know Winston, a tiny abandoned cub who imprints on Judy as she nurses him 24-7.

Cinematic shipwrecks of the Bahamas.

An island off the coast of Honduras stands out as a holiday resort hot spot, and more than just sun and sand brings the tourists in droves; divers consider the island a paradise of shipwrecks scattered from all corners of the island to explore.

Mexico's Yucatán Peninsula houses ships converted to artificial reefs.

Exploring marine life off the island of Bonaire; heavy tourism spurs a conservation effort.

Exploring ancient fire traditions and a sugar glider's daring escape from the flames.

Some of the most amazing hippo behavior happens after dark.

From the Galápagos Islands to the edge of Antarctica, island wildlife reveal insights into the rapidly changing planet.

Steve Leonard and his team of vets investigate the best way to help your pet lose weight; witness an operation to improve the life of a paralysed dachshund; they decode the secret language of guinea pigs.

Maya is ten weeks old and is starting to push the family to their limits; she wreaks havoc in the house, destroying the bookshelf, getting into the fridge and ripping up the sofa; she is also showing possessive behaviors with her toys.

Senior vet Tim tutors new recruit Phil through an injured koala checkup; the team's solutions for animals plagued by the summer heat; vet Karina solves a puzzling frog case and releases an old friend who's ready to fly.

Steve Leonard and his team of vets investigate the best way to help your pet lose weight; witness an operation to improve the life of a paralysed dachshund; they decode the secret language of guinea pigs.

Maya is ten weeks old and is starting to push the family to their limits; she wreaks havoc in the house, destroying the bookshelf, getting into the fridge and ripping up the sofa; she is also showing possessive behaviors with her toys.

Senior vet Tim tutors new recruit Phil through an injured koala checkup; the team's solutions for animals plagued by the summer heat; vet Karina solves a puzzling frog case and releases an old friend who's ready to fly.

Moving day arrives for the nursery school kids; Beni gets a beating from a bully; the socialization cage has a new queen; dominant male Pujon is still on a time-out after attacking Alba, but he's allowed a second chance to bond with his rival.

Steve Leonard and his team of vets investigate the best way to help your pet lose weight; witness an operation to improve the life of a paralysed dachshund; they decode the secret language of guinea pigs.

Maya is ten weeks old and is starting to push the family to their limits; she wreaks havoc in the house, destroying the bookshelf, getting into the fridge and ripping up the sofa; she is also showing possessive behaviors with her toys.

Senior vet Tim tutors new recruit Phil through an injured koala checkup; the team's solutions for animals plagued by the summer heat; vet Karina solves a puzzling frog case and releases an old friend who's ready to fly.

Celebrate as a newly arrived trio of sisters teaches Winston about friendship.

The St. Louis Zoo caters to a wide range of tastes for some of the world's largest eaters, including an anaconda and hippos.

The keepers at the St. Louis Zoo make sure that every animal family gets the proper nutrition.

Bobcats are returned to the wild.

Celebrate as a newly arrived trio of sisters teaches Winston about friendship.

The St. Louis Zoo caters to a wide range of tastes for some of the world's largest eaters, including an anaconda and hippos.

The keepers at the St. Louis Zoo make sure that every animal family gets the proper nutrition.

Beni faces a day of reckoning as all the forest school students are held back for a weigh-in; Alba is back in isolation after being diagnosed with typhoid.

Celebrate as a newly arrived trio of sisters teaches Winston about friendship.

Chris Packham investigates how nature's masterminds measure up against human brainpower; he explores how different animals, such as ravens, crows, bees and starlings, can use tools and solve complex puzzles.

Chris Packham reveals some of the cleverest animal communicators on the planet; for decades, people have longed to emulate Dr. Dolittle and be able to understand what animals are communicating to one another.

Chris reveals some of the best animal builders in the world, a group that is incredibly varied; accomplished animal architects include everything from beavers to bees and prairie dogs to bowerbirds.

Chris Packham looks at social intelligence in the animal kingdom, and finds out why it is that, for animals, being together means being clever; he looks at how lions hunt in teams, in which each holds a very specific position.

Steve Leonard and his team of vets investigate the best way to help your pet lose weight; witness an operation to improve the life of a paralysed dachshund; they decode the secret language of guinea pigs.

Maya is ten weeks old and is starting to push the family to their limits; she wreaks havoc in the house, destroying the bookshelf, getting into the fridge and ripping up the sofa; she is also showing possessive behaviors with her toys.

Senior vet Tim tutors new recruit Phil through an injured koala checkup; the team's solutions for animals plagued by the summer heat; vet Karina solves a puzzling frog case and releases an old friend who's ready to fly.

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

Enduring winter and early spring on the West Coast, where animals eke out a chilly existence; watching red deer battle on windswept Inishvickillane, welcome seal pups amid howling storms on the Inishkea Islands.

Exploring a 1,500-year-old monastery among the dizzying crags of the world-famous Skellig Islands; Spy Manx shearwaters and humpback whales, pygmy shrews on Clare, and the Aran Islands at an autumn spectacle.

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

Enduring winter and early spring on the West Coast, where animals eke out a chilly existence; watching red deer battle on windswept Inishvickillane, welcome seal pups amid howling storms on the Inishkea Islands.

Exploring a 1,500-year-old monastery among the dizzying crags of the world-famous Skellig Islands; Spy Manx shearwaters and humpback whales, pygmy shrews on Clare, and the Aran Islands at an autumn spectacle.

Beni faces a day of reckoning as all the forest school students are held back for a weigh-in; Alba is back in isolation after being diagnosed with typhoid.

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

Enduring winter and early spring on the West Coast, where animals eke out a chilly existence; watching red deer battle on windswept Inishvickillane, welcome seal pups amid howling storms on the Inishkea Islands.

Exploring a 1,500-year-old monastery among the dizzying crags of the world-famous Skellig Islands; Spy Manx shearwaters and humpback whales, pygmy shrews on Clare, and the Aran Islands at an autumn spectacle.

Bone up on outdoor skills as Winston and the X girls move into their new fresh-air enclosure; witness Yasmine and Yara's kindergarten power struggle.

The staff at the St. Louis Zoo deals with managing the nutritional needs of picky eaters.

Zookeepers feed the minds of their hungry animals. Whether it's puzzles and piñatas, or honey tubes and herb gardens, food is the icing on the cake to prevent boredom.

Hope tries to save an injured fawn.

Bone up on outdoor skills as Winston and the X girls move into their new fresh-air enclosure; witness Yasmine and Yara's kindergarten power struggle.

The staff at the St. Louis Zoo deals with managing the nutritional needs of picky eaters.

Zookeepers feed the minds of their hungry animals. Whether it's puzzles and piñatas, or honey tubes and herb gardens, food is the icing on the cake to prevent boredom.

Rescued orphan Josh needs his broken wrist examined by the school vets, while Beni has a trip to the dentist to treat his bad breath.

Bone up on outdoor skills as Winston and the X girls move into their new fresh-air enclosure; witness Yasmine and Yara's kindergarten power struggle.

When the Etosha pan fills with water in the summer, water birds congregate to breed.

The course of South Africa's Orange River.

Lions, hyenas and buffalo work together to survive in the Zambian wilderness.

More than 480 different species of birds spread their wings in the Luangwa Valley over the course of a year.

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

Enduring winter and early spring on the West Coast, where animals eke out a chilly existence; watching red deer battle on windswept Inishvickillane, welcome seal pups amid howling storms on the Inishkea Islands.

Exploring a 1,500-year-old monastery among the dizzying crags of the world-famous Skellig Islands; Spy Manx shearwaters and humpback whales, pygmy shrews on Clare, and the Aran Islands at an autumn spectacle.

Discover a city lying beneath the waves, where commuters flood the coral reef's main highways.

Nature's most wanted species don't get the respect they deserve, including the great white shark's electrical sensors, the razor-sharp limbs of the dead leaf mantis and the zombie-creating powers of cordyceps fungi.

Discover a city lying beneath the waves, where commuters flood the coral reef's main highways.

Nature's most wanted species don't get the respect they deserve, including the great white shark's electrical sensors, the razor-sharp limbs of the dead leaf mantis and the zombie-creating powers of cordyceps fungi.

Rescued orphan Josh needs his broken wrist examined by the school vets, while Beni has a trip to the dentist to treat his bad breath.

Discover a city lying beneath the waves, where commuters flood the coral reef's main highways.

Nature's most wanted species don't get the respect they deserve, including the great white shark's electrical sensors, the razor-sharp limbs of the dead leaf mantis and the zombie-creating powers of cordyceps fungi.

Navigate rain, new climbing structures, and a first meeting of the summer cubs.

Keepers dole out buckets of fresh fish for their sea lions and penguins and a bouquet of veggies for their century old tortoises.

Feeding critically endangered orangutans, cheetah and painted dogs.

Two birds with wing injuries.

Navigate rain, new climbing structures, and a first meeting of the summer cubs.

Keepers dole out buckets of fresh fish for their sea lions and penguins and a bouquet of veggies for their century old tortoises.

Feeding critically endangered orangutans, cheetah and painted dogs.

The babysitters try to get Beni's diet under control; Malika shows off her passion for fashion; Darryl and Syahrini get steamy in the treetops; Cinta makes a watery discovery; two new babies arrive, one of whom is emaciated.

Navigate rain, new climbing structures, and a first meeting of the summer cubs.

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

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.

Exploring ancient fire traditions and a sugar glider's daring escape from the flames.

The kangaroos that populate the woodlands, pastures and forests of Australia cluster together in groups known as mobs.

Discover a city lying beneath the waves, where commuters flood the coral reef's main highways.

Nature's most wanted species don't get the respect they deserve, including the great white shark's electrical sensors, the razor-sharp limbs of the dead leaf mantis and the zombie-creating powers of cordyceps fungi.

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.

Drop in at a pit stop for great whites and search for a north-south connection.

Aim for harmonious coexistence in spots where human and shark worlds collide.

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.

Drop in at a pit stop for great whites and search for a north-south connection.

Aim for harmonious coexistence in spots where human and shark worlds collide.

The babysitters try to get Beni's diet under control; Malika shows off her passion for fashion; Darryl and Syahrini get steamy in the treetops; Cinta makes a watery discovery; two new babies arrive, one of whom is emaciated.

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.

Drop in at a pit stop for great whites and search for a north-south connection.

Aim for harmonious coexistence in spots where human and shark worlds collide.

Spy on the summer cubs as they learn to climb trees and forage for food in preparation for their release into the wild; get surprised by a set of new arrivals, observe the annual pre-hibernation eating binge and enjoy a bear-friendly Thanksgiving.

Keepers can't let their guards down when it comes to feeding tigers, sun bears or rhinos.

Chemoreception was the first sense to evolve in animals.

A group of weasels is ready to be released; a volunteer attempts to rescue an eagle; a gull flies free.

Spy on the summer cubs as they learn to climb trees and forage for food in preparation for their release into the wild; get surprised by a set of new arrivals, observe the annual pre-hibernation eating binge and enjoy a bear-friendly Thanksgiving.

Keepers can't let their guards down when it comes to feeding tigers, sun bears or rhinos.

Chemoreception was the first sense to evolve in animals.

Difficult quarantine student Taymur has a breakthrough and starts to embrace his jungle school lesson; serial truant Luthy skips class again and gives the staff a run for their money.

Spy on the summer cubs as they learn to climb trees and forage for food in preparation for their release into the wild; get surprised by a set of new arrivals, observe the annual pre-hibernation eating binge and enjoy a bear-friendly Thanksgiving.

Dive to the dark depths of the sea to uncover the ocean's mysterious inhabitants; journey across vast stretches of open water with humpback whales, then wander down to the ocean floor to witness breathtaking bioluminescence.

Coasts are gateways from land to sea, offering opportunities to many creatures.

Uncover the profound significance and uncertain future of our rivers.

Our planet's freshwater lakes are cradles of life.

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.

Drop in at a pit stop for great whites and search for a north-south connection.

Aim for harmonious coexistence in spots where human and shark worlds collide.

The first 12 weeks of a Hereford calf's life as it makes friends and settles into the herd during the summer.

The Danube River, which stretches from the Alps to the Black Sea, supports a surprising range of wildlife and is coping with years of human impact. (2 of 3).

Heading out with Lizzie and the Oncafari team as they set out on the hunt for a missing, dominant jaguar; monitoring the battle between young individuals who are all coveting power.

The first 12 weeks of a Hereford calf's life as it makes friends and settles into the herd during the summer.

The Danube River, which stretches from the Alps to the Black Sea, supports a surprising range of wildlife and is coping with years of human impact. (2 of 3).

Heading out with Lizzie and the Oncafari team as they set out on the hunt for a missing, dominant jaguar; monitoring the battle between young individuals who are all coveting power.

Difficult quarantine student Taymur has a breakthrough and starts to embrace his jungle school lesson; serial truant Luthy skips class again and gives the staff a run for their money.

The first 12 weeks of a Hereford calf's life as it makes friends and settles into the herd during the summer.

The Danube River, which stretches from the Alps to the Black Sea, supports a surprising range of wildlife and is coping with years of human impact. (2 of 3).

Heading out with Lizzie and the Oncafari team as they set out on the hunt for a missing, dominant jaguar; monitoring the battle between young individuals who are all coveting power.

Prepare for the summer cubs' release with Roger; meet Ace and Little Blueberry, two newbies with serious health issues who will have to stay over the winter with the Z cubs; six happy, healthy bears embark on their new lives in the wild.

Animals use the sense of touch to feel physical forces in their environment.

Animals and different types of vision.

Preparations for the annual open house.

Prepare for the summer cubs' release with Roger; meet Ace and Little Blueberry, two newbies with serious health issues who will have to stay over the winter with the Z cubs; six happy, healthy bears embark on their new lives in the wild.

Animals use the sense of touch to feel physical forces in their environment.

Animals and different types of vision.

Six graduates from jungle school are finally set to be freed into the wild from the pre-release islands after an arduous journey by road and river into the heart of Borneo.

Prepare for the summer cubs' release with Roger; meet Ace and Little Blueberry, two newbies with serious health issues who will have to stay over the winter with the Z cubs; six happy, healthy bears embark on their new lives in the wild.

Get to know the Waterfront Pride: males Tom Tom and Caller, 8 lionesses, 10 youths, and Einstein, the grown cub who never left home; Einstein's defiance catches up with him when rivals from the Outsiders Pride make a play that seals his fate.

The pride tries to hunt down adequate food as drought conditions push them and their prey dangerously close to death; Einstein adapts to solo life, then assesses the damage after new mom Kalwezi fights for her cubs' lives.

Einstein fails to make new connections and weigh the pros and cons when Keeza and her cub are kidnapped by rival male Mad-Eye Moody.

Follow two families of cheetahs struggle against heat, starvation and predators on the Serengeti.

The first 12 weeks of a Hereford calf's life as it makes friends and settles into the herd during the summer.

The Danube River, which stretches from the Alps to the Black Sea, supports a surprising range of wildlife and is coping with years of human impact. (2 of 3).

Heading out with Lizzie and the Oncafari team as they set out on the hunt for a missing, dominant jaguar; monitoring the battle between young individuals who are all coveting power.

Endangered carnivores of Africa.

Returning to South Luangwa to see the new pups born to the mighty Manzi and the tiny-but-fearless Kakumbi packs; yearling Snowy faces a hungry hyena before a lion pride scatters Manzi mum Weka's pups and leaves her frantically searching for them.

There's a lion-hyena showdown with Julz as he hunts for the elusive Manzi pack, who are missing four of their precious pups; Henry from the Zambian Carnivore Programme is on a house call to the Kakumbi den, where another pup has gone AWOL.

Old friends and a breakaway Manzi trio; Kakumbi make a kill.

Julz and Henry from the ZCP track the Kakumbi pups, who face off with a stubborn, razor-tusked warthog; Thandie Mweetwa, ZCP's lion specialist, counts the prides that are pushing the Manzi out of their territory.

Endangered carnivores of Africa.

Returning to South Luangwa to see the new pups born to the mighty Manzi and the tiny-but-fearless Kakumbi packs; yearling Snowy faces a hungry hyena before a lion pride scatters Manzi mum Weka's pups and leaves her frantically searching for them.

There's a lion-hyena showdown with Julz as he hunts for the elusive Manzi pack, who are missing four of their precious pups; Henry from the Zambian Carnivore Programme is on a house call to the Kakumbi den, where another pup has gone AWOL.

Old friends and a breakaway Manzi trio; Kakumbi make a kill.

Julz and Henry from the ZCP track the Kakumbi pups, who face off with a stubborn, razor-tusked warthog; Thandie Mweetwa, ZCP's lion specialist, counts the prides that are pushing the Manzi out of their territory.

Six graduates from jungle school are finally set to be freed into the wild from the pre-release islands after an arduous journey by road and river into the heart of Borneo.

Endangered carnivores of Africa.

Returning to South Luangwa to see the new pups born to the mighty Manzi and the tiny-but-fearless Kakumbi packs; yearling Snowy faces a hungry hyena before a lion pride scatters Manzi mum Weka's pups and leaves her frantically searching for them.

There's a lion-hyena showdown with Julz as he hunts for the elusive Manzi pack, who are missing four of their precious pups; Henry from the Zambian Carnivore Programme is on a house call to the Kakumbi den, where another pup has gone AWOL.

Old friends and a breakaway Manzi trio; Kakumbi make a kill.

Julz and Henry from the ZCP track the Kakumbi pups, who face off with a stubborn, razor-tusked warthog; Thandie Mweetwa, ZCP's lion specialist, counts the prides that are pushing the Manzi out of their territory.

Along the world's longest border between Canada and the USA, wildlife lives with one foot in two worlds; animals walk a tightrope of barriers and conflicting regulations, where one step over the line can mean the difference between life and death.

Animals that detect sound waves in the air or water.

Animals have senses that can do marvelous things.

Two orphaned bobcats struggle to bond.

Along the world's longest border between Canada and the USA, wildlife lives with one foot in two worlds; animals walk a tightrope of barriers and conflicting regulations, where one step over the line can mean the difference between life and death.

Animals that detect sound waves in the air or water.

Animals have senses that can do marvelous things.

Big changes are afoot for some of the pupils at Orangutan Jungle School, where orphaned orangutans learn the forest skills they need to survive in the wild; four new arrivals join the nursery classes and some familiar faces move up a grade.

Along the world's longest border between Canada and the USA, wildlife lives with one foot in two worlds; animals walk a tightrope of barriers and conflicting regulations, where one step over the line can mean the difference between life and death.

Ninginganiq is so dangerous that even seasoned sailors keep away.

The Hudson Bay lowlands are critical to life in North America.

The Yukon is one of earths last true wildernesses.

It's November at Cape Tatnam, and though winter is coming to the lower Western shore of Hudson Bay, the ice, which should be forming by now, is nowhere to be seen.

Endangered carnivores of Africa.

Returning to South Luangwa to see the new pups born to the mighty Manzi and the tiny-but-fearless Kakumbi packs; yearling Snowy faces a hungry hyena before a lion pride scatters Manzi mum Weka's pups and leaves her frantically searching for them.

There's a lion-hyena showdown with Julz as he hunts for the elusive Manzi pack, who are missing four of their precious pups; Henry from the Zambian Carnivore Programme is on a house call to the Kakumbi den, where another pup has gone AWOL.

Old friends and a breakaway Manzi trio; Kakumbi make a kill.

Julz and Henry from the ZCP track the Kakumbi pups, who face off with a stubborn, razor-tusked warthog; Thandie Mweetwa, ZCP's lion specialist, counts the prides that are pushing the Manzi out of their territory.