Test limits with jaguar cub Frida, who's honing her survival skills in Brazil's Caiman Lodge Reserve.

The filmmaker sheds light on the long-standing rivalry between lions and hyenas in hunting and how they survive the wilderness.

Leaving their native home in South Africa, seven lions are being transported to Akagera National Park, covering thousands of miles to the heart of Africa, in order to revive the local lion species.

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

The Pacific Rim National Park Reserve is one of Canada's most beautiful and powerful parks.

This oldest National Park in the Canadian Maritimes is home to the highest density of moose in the world.

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

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

A polar bear and her cubs make a 400-mile journey from their birth den in Svalbard, Norway, to pack ice surrounding the North Pole.

Introducing a cast of charismatic animals to reveal the remarkable strategies they use to survive, and even thrive, in winter -- for animals this is the toughest time of year, and preparations start early.

The flood of fawns arrives; a pigeon gets some much needed relief; an animal is stuck in a car.

Palau is home to large manta rays, WWII wrecks, and a coral reef.

The Torngat Mountains National Park was set up in part to return the aboriginal people to their birthright.

Riding Mountain National Park in Manitoba.

The lions of Tanzania are the only cat species to live in groups; tiny rusty spotted cat of Sri Lankais 200 times smaller than a lion but just as curious.

After the dry season lowers the waters, siblings Kimba and Maya risk crossing the river to search for their parents; they run the gauntlet of the densest populations of crocs and hippos in Africa.

During the last few weeks of the dry season, the prides stick close to the only available water in the river; in Luangwa, the scent of a hippo kill compels the Hollywoods to cross the river.

The dry season is approaching its end, and the MK pride faces its toughest moment yet; their matriarch and best hunter, Surabi, is gored by a buffalo and her survival hangs in the balance; one of the youngest members of the pride is lost and alone.

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.

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.

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.

After the dry season lowers the waters, siblings Kimba and Maya risk crossing the river to search for their parents; they run the gauntlet of the densest populations of crocs and hippos in Africa.

During the last few weeks of the dry season, the prides stick close to the only available water in the river; in Luangwa, the scent of a hippo kill compels the Hollywoods to cross the river.

The dry season is approaching its end, and the MK pride faces its toughest moment yet; their matriarch and best hunter, Surabi, is gored by a buffalo and her survival hangs in the balance; one of the youngest members of the pride is lost and alone.

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.

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.

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.

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

Fundy National Park in southern New Brunswick.

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

Winter slowly releases its iron grip on the North Atlantic; meet a family of playful otters, a lovelorn Arctic fox, and a reindeer herd determined to reach their calving grounds despite the fearsome weather.

Experience the North Atlantic's intense, brief summer with its animal residents; follow Arctic fox cubs learning to hunt for survival, an otter pup going solo for the first time, a mate-seeking puffin, and tiny reindeer taking their first steps.

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.

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.

Recently released ravens are attacked; tiny orphans struggle; six stinky skunks.

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.

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.

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.

The lions of Tanzania are the only cat species to live in groups; tiny rusty spotted cat of Sri Lankais 200 times smaller than a lion but just as curious.

Following the nocturnal pursuits of the tiny black-footed cat in South Africa that stakes its claim to the title of the world's deadliest.

Following two cheetah mothers -- Savannah and her four cubs, in the Tswalu Kalahari Reserve, and Chili and her five kittens in the Great Karoo Wilderness -- as they navigate a harsh environment, dangerous wildlife and dwindling prey.

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

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.

The lions of Tanzania are the only cat species to live in groups; tiny rusty spotted cat of Sri Lankais 200 times smaller than a lion but just as curious.

Following the nocturnal pursuits of the tiny black-footed cat in South Africa that stakes its claim to the title of the world's deadliest.

Following two cheetah mothers -- Savannah and her four cubs, in the Tswalu Kalahari Reserve, and Chili and her five kittens in the Great Karoo Wilderness -- as they navigate a harsh environment, dangerous wildlife and dwindling prey.

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

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

Quttinirpaaq National Park is affected by climate change.

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

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.

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.

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.

Recent nursery graduates Jelapat, Talaken, Bawan and Rona join their classmates at their new classroom; Dilla unexpectedly gives birth at midnight, but the delivery does not go smoothly.

An eagle falls out of its nest; Hope's fawns are in trouble; an attic full of songbirds.

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.

Recent nursery graduates Jelapat, Talaken, Bawan and Rona join their classmates at their new classroom; Dilla unexpectedly gives birth at midnight, but the delivery does not go smoothly.

During spring on the Gomoti River, cheetah mother Phefo and lion mother Tshaba teach their cubs' survival skills; they protect their young from big male cats; lion king Molelo fights battles; leopard Senatia works to secure his legacy.

Tracking Molelo's pride, who are exhausted when the winter floods arrive and witnessing an encounter that gives leopard mum Sephiri a decision to make.

During spring on the Gomoti River, cheetah mother Phefo and lion mother Tshaba teach their cubs' survival skills; they protect their young from big male cats; lion king Molelo fights battles; leopard Senatia works to secure his legacy.

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.

Lizzie gets to know Fera, the Queen of the Pantanal, as she teaches her rambunctious cub Simba some essential jaguar skills, including how to climb trees and hunt for dinner.

Rejoining the team for some post-rainy-season drama as they search for Ferinha, Fera and Badalo, whose tracking collars are missing; meeting a new biologist, who helps Lizzie recollar the jaguars.

Lizzie and veterinarian Joares scramble to collar more jaguars amid storms, floods, and power outages.

The Onçafari team gets to know Aroeira, their newly collared female and takes a peek at Aurora's cub, Apolo; Badalo moves deeper into the flooded forest, where he puts Lizzie's game-changing research in jeopardy.

Tracking Molelo's pride, who are exhausted when the winter floods arrive and witnessing an encounter that gives leopard mum Sephiri a decision to make.

During spring on the Gomoti River, cheetah mother Phefo and lion mother Tshaba teach their cubs' survival skills; they protect their young from big male cats; lion king Molelo fights battles; leopard Senatia works to secure his legacy.

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.

Lizzie gets to know Fera, the Queen of the Pantanal, as she teaches her rambunctious cub Simba some essential jaguar skills, including how to climb trees and hunt for dinner.

Rejoining the team for some post-rainy-season drama as they search for Ferinha, Fera and Badalo, whose tracking collars are missing; meeting a new biologist, who helps Lizzie recollar the jaguars.

Lizzie and veterinarian Joares scramble to collar more jaguars amid storms, floods, and power outages.

The Onçafari team gets to know Aroeira, their newly collared female and takes a peek at Aurora's cub, Apolo; Badalo moves deeper into the flooded forest, where he puts Lizzie's game-changing research in jeopardy.

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

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

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

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.

Recent nursery graduates Jelapat, Talaken, Bawan and Rona join their classmates at their new classroom; Dilla unexpectedly gives birth at midnight, but the delivery does not go smoothly.

Welcoming autumn to the North Atlantic, when its animals struggle to prepare for winter; tracing the grey seals' mating frenzy and witnessing the horrific price one seal pup must pay; reindeer undertake a perilous swim along their migration path.

The highest mountain range is home to extraordinary animals and remarkable ancient cultures; snow leopards creep into isolated mountain villages; bizarre looking monkeys huddle for warmth; ancient Buddhist monasteries have rituals lost in time.

An old volunteer returns; an endangered orphan is rescued; a miracle on the half shell.

Raja Ampat in the Indonesian archipelago is home to diverse marine life, including manta rays.

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

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

It really is a big bad world out there; so what happens if you are the little guy.

In the Arizona desert, a new honey ant queen attempts to build and defend her empire; she uses murder, cannibalism and genocide in her quest for domination.

Australia's Great Barrier Reef is one of the natural wonders of the world and the largest living structure on the planet; Monty Halls explores the complexity of the reef itself and the wildlife that lives on it.

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.

Exploring the shores of the Northern Territory and the abundant waters of the Great Barrier Reef; Lizzie faces flooded roads, hungry saltwater crocs, and killer jellyfish as she investigates why many deadly creatures make remote areas their home.

Saying goodbye to the tropics and dipping into the cool southern-coast waters; witnessing grey nurse sharks, shape-shifting cuttlefish and blue whales; playing with penguins and sea lions.

Completing the trip's final lap in the untamed lands where Australia's interior desert meets the Indian Ocean; confronting the challenges of survival in the region; Lizzie dives with tiger sharks, manta rays and nomadic turtles.

A look at whether Australian animals' weapons, such as the kangaroo's boxing moves and the redback spider's traps, can help them survive climate change.

Witnessing clashes over precious resources when the dry season brings a band of gladiators to an African savannah watering hole; a lion-elephant territory brawl, an ant raid on a termite mound and a honey badger's risky dance with a deadly snake.

Young gladiators earn their stripes in the dense tropical forests of the Americas; a poison dart frog launches a toxic barrage, observe a jaguar-caiman turf war, and see a hungry coati cross paths with a defensive tarantula.

Heading to America's far north for a peek at the ultimate fighters that live along its waterways; a spring thaw kicks off the competition, pitting eagles against herons, bears against bears, and dragonfly nymphs against venomous giant water bugs.

Wildlife and the environment.

Wildlife and the environment.

Getting to know all 18 members of the penguin family, including the quirky ones.

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

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

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

Flora and fauna help each other navigate seasonal changes in the forest.

Wading into wetlands, where trees and water meet to nurture new life; diving into an underwater forest that protects young fur seals; visiting a mangrove sanctuary where a curious band of aquatic misfits hides out.

Climbing into a realm of thin air and towering rock; tagging along as mythical monkeys battle for a winter food stash; singing along with lemurs in a fruit-filled tree canopy.

Admire arctic animals' secret superpowers of survival.

A bald eagle needs Hope's help; a small but lethal patient keep the entire staff on their toes.

The Indonesian archipelago lies has the highest number of coral and fish species on earth.

The scattered terrain of St. Lawrence Islands.

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

Getting to know all 18 members of the penguin family, including the quirky ones.

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.

A dangerous tagging mission in South Australia that shows what sharks eat and why they gather in feeding hot spots; the team chases tiger, bull, and hammerhead sharks and outfits one with a 360-degree dorsal camera.

Tracking a pregnant shark along the Great Barrier Reef and see if she leads a team of scientists to her hidden pupping ground; searching for signs of mating along the Southern Coast.

Stay up late as the northern team attaches an activity tag to a bull shark and finds out what this night owl does after sunset. Then dive 80 metres deep with the southern team, who are hoping to put a satellite tracker on a female great white.

Contemplating shark community hierarchies as the northern team studies how young blacktips learn social and survival skills; rushing to Rainbow Beach with the southern team, who are eager to witness the sand tiger shark's mating.

Traveling to the ends of Australia's shark highways; finding out if Greenly Island in the south is a truck stop for migrating great whites; searching for proof of a genetic connection between northern bull sharks and their cooler-climate cousins.

The southern team tests new migration tech and tools that could reduce shark attacks in a popular snorkeling spot; the northern team catches and tags bull sharks to help local swimmers steer clear of birthing mothers.

Showcases how bears across the world have overcome the challenges of life, from finding food and raising cubs, to confronting rivals and habitat loss, all thanks to brains, brawn and amazing adaptability.

Stage 1 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.

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.

Every year, up to 80 polar bears gather on the frozen shores of Barter Island on the Arctic coast of Alaska.

Following a courageous ghost bear and her cubs on Canada's remote rain forest islands.

Wildlife and the environment.

From the icy peaks of age-old mountain glaciers to the fog-shrouded canopies of Canada's only rainforest, it's the wettest place in North America.

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

Exploring the only island park in the Canadian Maritimes.

A trio of Elephants in Zambia are rescued.

Elephants in Camp Phoenix in Zambia's Kafue National Park.

Endangered carnivores of Africa.

The effects of poaching.

A hunt for a misunderstood coyote; the ravens have worn out their welcome and need a new home.

Fascinating creatures thrive in the muck.

Canada's largest national park.

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

Wildlife and the environment.

Following two cheetah mothers -- Savannah and her four cubs, in the Tswalu Kalahari Reserve, and Chili and her five kittens in the Great Karoo Wilderness -- as they navigate a harsh environment, dangerous wildlife and dwindling prey.

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

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.

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.

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.

During spring on the Gomoti River, cheetah mother Phefo and lion mother Tshaba teach their cubs' survival skills; they protect their young from big male cats; lion king Molelo fights battles; leopard Senatia works to secure his legacy.

Tracking Molelo's pride, who are exhausted when the winter floods arrive and witnessing an encounter that gives leopard mum Sephiri a decision to make.

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.

Lizzie gets to know Fera, the Queen of the Pantanal, as she teaches her rambunctious cub Simba some essential jaguar skills, including how to climb trees and hunt for dinner.

Rejoining the team for some post-rainy-season drama as they search for Ferinha, Fera and Badalo, whose tracking collars are missing; meeting a new biologist, who helps Lizzie recollar the jaguars.

Lizzie and veterinarian Joares scramble to collar more jaguars amid storms, floods, and power outages.

The Onçafari team gets to know Aroeira, their newly collared female and takes a peek at Aurora's cub, Apolo; Badalo moves deeper into the flooded forest, where he puts Lizzie's game-changing research in jeopardy.

Scientists are studying cats in greater detail than before, and their groundbreaking finds challenge the conventional ideas.

Revisiting the Savute Marsh's pride of lions in Southern Africa, who re-wrote the laws of nature and started to hunt elephants in order to stave off starvation and survive.

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

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

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

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.

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

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

Allison brings her work home; some orphans try to make a break for it while Allison and Hope are away.

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

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

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

Revisiting the Savute Marsh's pride of lions in Southern Africa, who re-wrote the laws of nature and started to hunt elephants in order to stave off starvation and survive.

Steve Backshall explores the moves animals make in pursuit of romance, from soliciting that first amorous glance, to the final act of seduction. The colourful cast includes beautiful birds of paradise, ring-tailed lemurs and a tiny brown banana frog.

Steve Backshall looks at the dance-like moves that animals perform to survive all aspects of life.

From hippos and their exfoliating fish friends, to ravens and their wolverine dinner dates, Bill Bailey introduces the most extraordinary partnerships in nature.

With the help of some surprising creatures from around the world, we'll discover how animals take to the air, defying the force all airborne animals must conquer - gravity.

We are up and away with the world of powered flight - revealing why peregrine falcons can top 200 miles an hour, how a hummingbird is a slave to its own rather manic lifestyle, and that the albatross's secret to flying for free... is it's nose!

In the busy skies above our planet we'll meet a creature that creates sound out of thin air with the world's fastest courtship display and arguably the worlds most aggressive bird, harnessing cold aggression to protect its patch of sky.

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

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

Animals go to extraordinary lengths to survive in the hottest and driest extremes, from the Sahara Desert to Australia.

Polar bears in the Arctic, penguins in Antarctica and other animals on icy islands can reveal changes taking place at the planet's frozen extremes.

Scientists take a look at animal species with the power to transform and restore grasslands.

Patrick Aryee follows grizzly bears that are taking a risk by leaving their winter dens early; hungry wolves are struggling to bring down their elk prey in the unusually shallow snow.

As winter turns to spring, temperatures rise and Yellowstone bursts into life; beavers feast on new green shoots, baby bison take their first faltering steps and grizzly cubs emerge from their dens.

Summer in Yellowstone brings about new challenges; as food becomes scarce, wolves have a surprising strategy to keep their pups fed.

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

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

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

Animals go to extraordinary lengths to survive in the hottest and driest extremes, from the Sahara Desert to Australia.

Polar bears in the Arctic, penguins in Antarctica and other animals on icy islands can reveal changes taking place at the planet's frozen extremes.

Scientists take a look at animal species with the power to transform and restore grasslands.

A recompilation of the best moments of Wild Latam, including capuchin monkeys breaking nuts in Brazil, pink dolphins swimming in the Amazon, the munguba tree, elephant seals, and more.

The open house is bigger than ever, which brings about more challenges.

Sharks are at risk in Costa Rica.

A healthy bison population is threatened by where they eat.

The Grasslands National Park protects the North American mixed grass prairie.

It really is a big bad world out there; so what happens if you are the little guy.

Exploreing the captivating cityscape, where Matnoor rules over the 30-member-strong Street Troop, before meeting the wilder Hill Troop's old alpha, Aarav.

The Hill Troop invades the Street Troop's turf before the Sisterhood plots to kidnap Sara's baby, and the alpha Loci discovers that his old rival has made a return.

A brawl erupts after the Street Troop finds the Hill Troop on their turf before the alpha wannabe Ajit makes his move.

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

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

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

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

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

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.

A veterinarian and his team encounter dangerous challenges as they care for endangered animals at a hospital in the Guatemalan jungle.

Meet the Kyambura clan, which has been trapped in a lush gorge in Africa's Albertine Rift for 15 years. Witness the daily life-and-death struggle of its 20 remaining chimpanzees, who must find food, elude predators, and try to raise a new generation.

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.

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

Sheep are followed through the first 12 weeks of a lamb's life on a Welsh Hill farm where it is discovered that sheep are highly social animals.

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

Feeding a Giant Panda cub named Bao Bao.

Feeding a pride of adolescent lions.

Getting acquainted with an array of ocean oddballs and learning how billions of years' worth of changes have shaped their looks and skills; meeting blind worms who fish, walking sharks, tree-climbing crabs and much more.

Feeling the love in the strange-but-heartwarming partnerships between some of Earth's oddest creatures; diving deep to see strange animals, from snapping shrimp to wolf eels, offer a hand to their fellow ocean-going weirdos to ensure mutual survival.

Beni and Lala are confined to the clinic following an accident; bullied Kesi causes concern for the team; Clara and her daughter, Clarita, are chosen for release back into the wild.

Beni and Lala are going stir-crazy in the sick bay, but they must recover before returning to the rough and tumble of class; at forest school, a termite-foraging lesson inspires class clown Valentino to make a finger-licking discovery.

Never seen before footage of Hope's greatest stories.

Beni and Lala are confined to the clinic following an accident; bullied Kesi causes concern for the team; Clara and her daughter, Clarita, are chosen for release back into the wild.

Beni and Lala are going stir-crazy in the sick bay, but they must recover before returning to the rough and tumble of class; at forest school, a termite-foraging lesson inspires class clown Valentino to make a finger-licking discovery.

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.

Stage 1 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.

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.

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.

Chris Packham reveals the intelligent cons and deceitful behavior that animals use to survive and prosper in the game of life, from disguising themselves to outwit predators, to kidnapping babies to save their own offspring.

Chris discovers the cleverest animal travellers and how they find their way, from deer with mental maps, blue whales' planning routes, and dung beetles navigating by the stars.

A closer look at the agility, intelligence and imagination of squirrels, a commonly unnoticed animal found in many American backyards.

The team uncover the hidden lives of three animals. In the Kalahari Desert they put cameras on wild meerkats, in Cameroon, Gordon and scientist Mimi Swift look at a four-year-old orphan chimp, and in Argentina, penguins carry cameras far out to sea.

In Namibia, Gordon joins a cheetah conservationist who wants to see if three orphaned cheetahs can learn to hunt; in Australia, the team put cameras on fur seals; in South Africa, the team deploy the first ever cameras on wild baboons.

In the heart of the Atlantic, a team looks at devil rays, fish with "wings" nearly 13 feet across; in northeast Turkey, cameras are carried by brown bears and in southern France, on-board cameras look at guard dogs protecting sheep flocks.

The Everglades during the winter season.

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

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

Beni and Lala are confined to the clinic following an accident; bullied Kesi causes concern for the team; Clara and her daughter, Clarita, are chosen for release back into the wild.

Beni and Lala are going stir-crazy in the sick bay, but they must recover before returning to the rough and tumble of class; at forest school, a termite-foraging lesson inspires class clown Valentino to make a finger-licking discovery.

Three-year-old Wine ditches lessons to make a remarkable new friend, as she bonds with a young macaque; two refugees from a Thai circus, young mother Sampit and her son Sawadee, get a second chance at living semi-wild on a pre- release island.

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.

A huge storm sweeps an unusual patient into Hope for Wildlife, and Hope tries to return him to his home.

Three-year-old Wine ditches lessons to make a remarkable new friend, as she bonds with a young macaque; two refugees from a Thai circus, young mother Sampit and her son Sawadee, get a second chance at living semi-wild on a pre- release island.

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.

Wildlife and the environment.

An Antarctic gentoo penguin pops the question with a rocky token of his devotion; how a Madagascar lemur uses toxic millipedes for pest control; makeup techniques with a flamingo; a honey badger that can pick locks.

Hermit crabs have an orderly shell exchange on a Belize beach; meeting a Senegalese chimp's pet genet; an otter who swaps hostages for free meals; the agricultural prowess of leafcutter ants in the rainforest.

Tenacious meerkat pups are determined to devour deadly scorpions in the vast Kalahari Desert; a group of lionesses demonstrate their seduction tactics in Kenya.

Frigate birds steal meals from smaller seabirds; a mongoose-run spa with a grateful warthog; decoding an African elephant's secret message; lovelorn capuchin monkeys hurl rocks to attract prospective mates.

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

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

Gordon Buchanan meets the animals that live in nature's winter wonderlands. He reveals their survival secrets, from the polar bear mother that gives her cubs the best possible start in life to the owl that finds food hidden beneath a blanket of snow.