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.

Today, more than half of the world's primates are under threat of extinction; meeting the scientists making discoveries about this animal family, and the people safeguarding their future.

Experience the phenomena that swirl across the heavens in North America; watch polar bears search for food under the aurora borealis; map the frigid path of a polar vortex; elude violent tornadoes with a prairie dog family.

Weigh the evolutionary advantages of nature's speed demons and slowpokes.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

A plethora of creatures seek refuge from the rise and fall of the tide in Duncan's Cove and the Bay of Fundy.

A look at two very different insect species showcasing their expert pollination skills at Nova Scotia's Annapolis Valley; honey bees and monarch butterflies.

Baby seals and two beautiful birds arrive at Hope for Wildlife.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

A plethora of creatures seek refuge from the rise and fall of the tide in Duncan's Cove and the Bay of Fundy.

A look at two very different insect species showcasing their expert pollination skills at Nova Scotia's Annapolis Valley; honey bees and monarch butterflies.

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.

A breathtaking journey down the German section of the beautiful Moselle river, famous for vineyards on its dramatically steep banks and remarkable meandering loops.

The fruit and flowers from a rare tree in Africa provide sustenance for the animals during the dry season.

The camelthorn tree provides life to creatures that dwell in Africa's Kalahari.

The Sandveld has a huge variety of life within its various ecosystems.

The Namaqualand of South Africa briefly transforms every spring from a desert to an oasis.

Today, more than half of the world's primates are under threat of extinction; meeting the scientists making discoveries about this animal family, and the people safeguarding their future.

Experience the phenomena that swirl across the heavens in North America; watch polar bears search for food under the aurora borealis; map the frigid path of a polar vortex; elude violent tornadoes with a prairie dog family.

Weigh the evolutionary advantages of nature's speed demons and slowpokes.

Zambia's wildest places are a paradise for the animals that call them home, including the Luangwa River Valley, the Liuwa Plain and the Kasanka National Park.

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.

Zambia's wildest places are a paradise for the animals that call them home, including the Luangwa River Valley, the Liuwa Plain and the Kasanka National Park.

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.

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.

Zambia's wildest places are a paradise for the animals that call them home, including the Luangwa River Valley, the Liuwa Plain and the Kasanka National Park.

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.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Animals that survive in cities.

Cape Breton Highlands National Park faces destruction by various species.

A project goes wrong; Hope tries to save chicks stuck in their shells; searching for orphaned foxes.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Animals that survive in cities.

Cape Breton Highlands National Park faces destruction by various species.

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.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Elephants in the Lilayi Elephant Nursery and Kafue National Park.

The secrets of Kinda baboons, a newly-identified species that's still little understood.

Territory is home, and the place where animals rest, find food or have their children; many animals mark, protect and defend their small nations against the invasion of strangers because their survival depends on it.

Exploring the many species that live in complex and hierarchical societies.

Zambia's wildest places are a paradise for the animals that call them home, including the Luangwa River Valley, the Liuwa Plain and the Kasanka National Park.

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.

A look at the wide variety of creatures - both native and invasive - that currently occupy the city of Miami, including peacocks, pythons and parrots.

Chase three young gazelles as they navigate the perils of life in the Serengeti.

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

A look at the wide variety of creatures - both native and invasive - that currently occupy the city of Miami, including peacocks, pythons and parrots.

Chase three young gazelles as they navigate the perils of life in the Serengeti.

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

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.

A look at the wide variety of creatures - both native and invasive - that currently occupy the city of Miami, including peacocks, pythons and parrots.

Chase three young gazelles as they navigate the perils of life in the Serengeti.

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

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Marshes and bogs are home to the endangered Blanding's Turtle, but the habitat is disappearing.

The complicated relationships of crustaceans.

A moose arrives mysteriously; fawns flood the rehab.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Marshes and bogs are home to the endangered Blanding's Turtle, but the habitat is disappearing.

The complicated relationships of crustaceans.

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.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

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

Marine protected areas in Florida.

The Monterey Bay National Marine Sanctuary is the largest marine sanctuary in the United States.

A two-year-old Tasmanian Devil named Carlos looks for food and fights for dominance.

A look at the wide variety of creatures - both native and invasive - that currently occupy the city of Miami, including peacocks, pythons and parrots.

Chase three young gazelles as they navigate the perils of life in the Serengeti.

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

The staff steps up to release the few remaining patients, when Hope suffers a personal tragedy.

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.

Follow vet Tim as he races to save rescued koala Ashley; then meet a flying fox with an extra digit who needs some TLC from vet Martine; calculate the odds for a run-over kangaroo joey with vet Emily; then celebrate the release of 50 lorikeets.

The staff steps up to release the few remaining patients, when Hope suffers a personal tragedy.

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.

Follow vet Tim as he races to save rescued koala Ashley; then meet a flying fox with an extra digit who needs some TLC from vet Martine; calculate the odds for a run-over kangaroo joey with vet Emily; then celebrate the release of 50 lorikeets.

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.

The staff steps up to release the few remaining patients, when Hope suffers a personal tragedy.

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.

Follow vet Tim as he races to save rescued koala Ashley; then meet a flying fox with an extra digit who needs some TLC from vet Martine; calculate the odds for a run-over kangaroo joey with vet Emily; then celebrate the release of 50 lorikeets.

Biologists race the clock as they try to figure out why North American loons are suddenly in danger, unlock the mysterious lives of these beloved birds, and ponder whether their cries will continue to be summer's soundtrack or go silent forever.

Wild horses and ponies on the last of France's overseas territory.

Invasive species like rabbits and starlings can have a negative impact on native species.

A fox needs several surgeries to survive; four raptors leave Hope for Wildlife.

Biologists race the clock as they try to figure out why North American loons are suddenly in danger, unlock the mysterious lives of these beloved birds, and ponder whether their cries will continue to be summer's soundtrack or go silent forever.

Wild horses and ponies on the last of France's overseas territory.

Invasive species like rabbits and starlings can have a negative impact on native species.

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.

Biologists race the clock as they try to figure out why North American loons are suddenly in danger, unlock the mysterious lives of these beloved birds, and ponder whether their cries will continue to be summer's soundtrack or go silent forever.

The wildlife rescue team attempt to collar an elephant, save a vervet monkey's leg, and help a baboon fend for herself.

Amanda and Mandy try everything at their disposal to help a snared hyena; the team's plan to release a troop of 13 monkeys is halted by last-minute surgery and some crafty escapees.

A troop of rescue center monkeys that have adopted a litter of stray kittens; a loyal dog helping a rescued raccoon overcome her fears; an emu raised by Irish setters.

Meet more Amazing Animal Friends, including ranch manager Barclay, a Great Dane who happens to be a gifted horse whisperer. In Africa, a tiny marmoset called Thor has become obsessed with two young rescued mongooses.

The staff steps up to release the few remaining patients, when Hope suffers a personal tragedy.

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.

Follow vet Tim as he races to save rescued koala Ashley; then meet a flying fox with an extra digit who needs some TLC from vet Martine; calculate the odds for a run-over kangaroo joey with vet Emily; then celebrate the release of 50 lorikeets.

A look at how Ningaloo's conservation miracle could inspire humans to pull the planet back from the brink of climatic destruction; an abandoned whaling station and other ruins show the tools, if only humans can find the will to change.

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

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

A look at how Ningaloo's conservation miracle could inspire humans to pull the planet back from the brink of climatic destruction; an abandoned whaling station and other ruins show the tools, if only humans can find the will to change.

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

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

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.

A look at how Ningaloo's conservation miracle could inspire humans to pull the planet back from the brink of climatic destruction; an abandoned whaling station and other ruins show the tools, if only humans can find the will to change.

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

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

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

Canada's east coast experiences all four seasons.

Overpopulation of deer in Hampton, N.B.

A patient moves towards recovery; a mysterious illness kills dozens of animals.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

Canada's east coast experiences all four seasons.

Overpopulation of deer in Hampton, N.B.

Scientists and enthusiasts reveal the crucial roles bugs play on the planet and what the future would be without them.

The colorful world of Earth's essential pollinators - bees, moths and butterflies.

The ruthless realm of some of the stealthiest and cleverest insects in the animal kingdom - from praying mantises and aquatic insects to dragonflies.

The crucial ecological roles that beetles play in nearly every environment, and why they are often regarded "the most important species on the planet.".

Animals - and a plant - that use stench to survive.

Bizarre birds have various adaptations.

Predators must kill to survive, but their next meal is always in question.

Snakes, spiders, and scorpions comprise some of the most venomous creatures in the world.

Sharks are some of the oldest predators still living.

Reptiles have expanded into nearly every habitat in Africa.

A high-tech autopsy on a Nile crocodile unlocks secrets behind its hunting prowess.

A look at the cold-blooded residents of Madagascar.

The Savanna's woodland of southern Africa is a unique ecosystem in the world. A great amount of branches and bushes have created a dark maze, where predators and preys are in a continuous state of tension. Visibility is little.

Zambia's Luangwa Valley possesses a remarkable ecosystem; home to some of the most iconic African species, it is also teeming with a host of smaller animals.

Madagascar is home to strange animals not found anywhere else on Earth; when these animals fight for supremacy, their battles are just as strange, from weird neck-wrestling weevils to ring tailed lemur moms that go into battle with baby on board.

Australia is home to an eclectic array of creatures, and the ways to succeed as an alpha are just as diverse; the beach turns into a dueling ground and the outback becomes a boxing ring, as animals face off with their own kind.

The African savanna is an epic landscape, and whether it's head-bashing hippos, hormone-crazed elephants or dueling lions, battles that rage on the savanna are just as epic.

Welcome to India - a land of exotic animals and exotic warfare; monkeys stage dusty dust-ups, blackbucks wage open war on the open plains, and peacock dandies swing switchblades: these are colorful battles worthy of a vibrant land.

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.

Dipping into North America's southern coastal waters, where squid mate, sea turtles nest and mobula rays take flight for the sake of romance; flying a drone with Lizzie as she swoops in for a breath sample from a blue whale.

Predators must kill to survive, but their next meal is always in question.

Chatty capuchin monkeys; Eurasian river otters' chilling screams; fruit bats' loud complaints; orcas' human-scale speech systems.

Madagascar is home to strange animals not found anywhere else on Earth; when these animals fight for supremacy, their battles are just as strange, from weird neck-wrestling weevils to ring tailed lemur moms that go into battle with baby on board.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Marine life in the waters surrounding Brier Island in Nova Scotia includes dolphins and humpback whales.

A look at unique adaptations in animals' heads and necks.

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

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Marine life in the waters surrounding Brier Island in Nova Scotia includes dolphins and humpback whales.

A look at unique adaptations in animals' heads and necks.

Scientists from around the world reveal what makes sharks the ocean's ultimate predators.

Sharks are the ocean's most resilient hunters; discovering just how far they are willing to go.

Sharks have adapted to thrive in extreme places.

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.

Some survival adaptations make creatures ugly.

Animals that employ trickery: stick bugs, lion fish, emperor scorpions, and chameleons.

Navigate a mangrove forest in Borneo with the saltwater crocodile, which is perfectly suited to life among the watery roots; discover how this reptile uses the environment to regulate its temperature and why its patience makes it a good hunter.

How snakes have adapted to become one of evolution's most amazing success stories.

The tiny-but-deadly mantises; how these notorious, alienlike insects capitalize on their versatility, strength, and aggressive attitude to become one of nature's most successful hunters.

Apex predators use superior strength and cunning strategies to stay at the top of the food chain.

North American birds of prey can catch a wide range of animals in different environments.

Predators evolved to hunt insects have a plentiful and easy to consume food source.

Researchers study shark behavior and fight for the protection of these predators.

Researchers risk everything to unlock secret shark behaviours, challenge myths about sharks, and fight for the protection of these predators.

In some of the most-remote regions on the planet, researchers dive deep and brave danger to unlock secret shark behaviors; they fight for the protection of these supreme predators before it's too late.

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

Predators must kill to survive, but their next meal is always in question.

Snakes, spiders, and scorpions comprise some of the most venomous creatures in the world.

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

The Yukon River boasts one of the longest salmon runs in the world; from musk ox to ice bears, there is a rich variety of life that call this frozen river home.

Roaming across America with a road-tripping chicken and meeting a mouse family living in an English garden; beating arachnophobia with a spider's help; trekking with the guardian of Earth's last two northern white rhinos.

Cockatoos and platypuses inspire new careers; a shared trauma bonds a human and an elephant for life; George the turkey vulture gets playful; a farewell to human-raised kangaroos.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

At look at the effects humans have had on the evolution of other animals.

Internal adaptations that animals have evolved.

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

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

At look at the effects humans have had on the evolution of other animals.

Internal adaptations that animals have evolved.

A high-tech autopsy on a Nile crocodile unlocks secrets behind its hunting prowess.

A look at the cold-blooded residents of Madagascar.

The Savanna's woodland of southern Africa is a unique ecosystem in the world. A great amount of branches and bushes have created a dark maze, where predators and preys are in a continuous state of tension. Visibility is little.

Zambia's Luangwa Valley possesses a remarkable ecosystem; home to some of the most iconic African species, it is also teeming with a host of smaller animals.

Recent research into bird-like qualities of dinosaurs.

Animals that have evolved unusual abilities.

Scientists and enthusiasts reveal the crucial roles bugs play on the planet and what the future would be without them.

The colorful world of Earth's essential pollinators - bees, moths and butterflies.

The ruthless realm of some of the stealthiest and cleverest insects in the animal kingdom - from praying mantises and aquatic insects to dragonflies.

The crucial ecological roles that beetles play in nearly every environment, and why they are often regarded "the most important species on the planet.".

Steering clear of alphas, whose horns, claws and other protective gear keep them ready for battle, no matter what the weather dishes out; examining killer Highland cow horns, plucky mallard bills, razor-edged wolverine claws, and more.

A male brown hare throws punches at his beloved; admiring a sandhill crane dance battle; ibexes butt heads (literally) during mating season; why leopards are stealth masters.

Meeting alphas who get by with a little help from their friends; the inescapable gang mentality of mating male dolphins; ant colonies' unique scents; female geladas always get the last word; wolves hunt family-style.

Celebrating small but mighty animal warriors armed with sheaves of scary weapons; admiring nutrias' stink bombs; honey badgers' needlelike choppers; black-tailed gulls' razor-sharp beaks; the killer talons on dive-bombing peregrine falcons.

Elands lock corkscrew horns; storks rattle sabre-shaped beaks; rhinos scare the competition with massive horns; striped marlins spear unsuspecting prey.

Tasmanian devils get into food fights with rivals; how dung beetles roll over the competition; wild boars' fierce mating strategies; hyenas' bone-crushing teeth demolish any meal.

The blonde manes of golden snub-nose monkeys; pink flamingo feathers brought on by an all-crustacean diet; the markings of gemsboks and cheetahs.

A gorilla wrestling match, pushy moose antlers, long pelican bills that snap at any enemy within range, and a megashark's stereo sniffer.

Sea lions throw their weight around to win a mate, Cape buffalo deliver knockout punches, Canada geese hit hard with their wings, and lionesses rule the Savanna with an iron paw.

Warthogs' lumpy armor, giant African bullfrogs' jumping and biting skills, wild turkeys' sharp beaks and razorlike spurs, and Nile crocodiles' powerful jaws.

A glacial stroll alongside a Galápagos tortoise; dancing with venomous European adders; a battle between Lacerta lizards; leopard seals' stealth attacks.

Chatty capuchin monkeys; Eurasian river otters' chilling screams; fruit bats' loud complaints; orcas' human-scale speech systems.

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

Navigate a mangrove forest in Borneo with the saltwater crocodile, which is perfectly suited to life among the watery roots; discover how this reptile uses the environment to regulate its temperature and why its patience makes it a good hunter.

Observe the eternal search for water that defines the lives of Africa's wild animals; witness the biggest marine feeding frenzy on Earth, see how cobras stock up on solar power and join wildebeest herds and elephant clans on their migrations.

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

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

The evolution of various eyes and adaptations that exploit vision.

Cooperative and social adaptations and evolution.

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

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

The evolution of various eyes and adaptations that exploit vision.

Cooperative and social adaptations and evolution.

Researchers study shark behavior and fight for the protection of these predators.

Researchers risk everything to unlock secret shark behaviours, challenge myths about sharks, and fight for the protection of these predators.

In some of the most-remote regions on the planet, researchers dive deep and brave danger to unlock secret shark behaviors; they fight for the protection of these supreme predators before it's too late.

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

Cold-blooded predators are brutal and cunning killers.

Many animals use mimicry, poison, and other methods to avoid predators.

Scientists from around the world reveal what makes sharks the ocean's ultimate predators.

Sharks are the ocean's most resilient hunters; discovering just how far they are willing to go.

Sharks have adapted to thrive in extreme places.

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.

Predators must kill to survive, but their next meal is always in question.

Snakes, spiders, and scorpions comprise some of the most venomous creatures in the world.

Sharks are some of the oldest predators still living.

Reptiles have expanded into nearly every habitat in Africa.

Scientists and enthusiasts reveal the crucial roles bugs play on the planet and what the future would be without them.

The colorful world of Earth's essential pollinators - bees, moths and butterflies.

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.

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.

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.

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.

The St. Lawrence River is one that forged North America, allowing ships to traverse the continent; the adventure begins in Canada's first capital city of Kingston and near Canada's second largest city of Montreal.

Animals that have change little in millions of years, sometimes called living fossils.

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

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

The St. Lawrence River is one that forged North America, allowing ships to traverse the continent; the adventure begins in Canada's first capital city of Kingston and near Canada's second largest city of Montreal.

Animals that have change little in millions of years, sometimes called living fossils.

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

Madagascar is home to strange animals not found anywhere else on Earth; when these animals fight for supremacy, their battles are just as strange, from weird neck-wrestling weevils to ring tailed lemur moms that go into battle with baby on board.

Australia is home to an eclectic array of creatures, and the ways to succeed as an alpha are just as diverse; the beach turns into a dueling ground and the outback becomes a boxing ring, as animals face off with their own kind.

The African savanna is an epic landscape, and whether it's head-bashing hippos, hormone-crazed elephants or dueling lions, battles that rage on the savanna are just as epic.

Welcome to India - a land of exotic animals and exotic warfare; monkeys stage dusty dust-ups, blackbucks wage open war on the open plains, and peacock dandies swing switchblades: these are colorful battles worthy of a vibrant land.

Massive elephant seals go nose to nose to win the title of beach master; giant petrels earn the nickname "murderous garbagemen"; a female humpback goes to extremes to protect her calf from amorous males.

Canada, where summer is short and time is tight, any time is the right time to fight; the mighty North provides the setting for bison, bald eagles and polar bears to wage some of the most heavy-duty fighting in the animal kingdom.

Learning to fight dirty with a guanaco, head-butting a fellow iguana to claim a piece of prime territory, and meeting a hermit crab who forcibly evicts a tenant from its shell.

With real-life dueling dragons, giant sumo-wrestling beetles, street-fighting monkeys, and sea turtles that play king of the hill - on top of another sea turtle, Southeast Asia boasts a wide range of wildlife warriors.

Bighorn rams rattle the mountaintops; Brown bears battle, desperate to fatten up for winter; Sharp-tailed grouse shake their tail-feathers; Wild stallions rumble with beauty and grace.

From the Highlands to the Alps, Europe's evocative landscapes are the backdrop for epic wildlife drama; normally stoic red deer go wild during the rut; wolf packs clash over territory, and foxes do the foxtrot but it's not as nice as it sounds.

Wildebeest battle for herd hierarchy, meerkats live the thug life, floppy fish fight it out on land and locusts give up their vegetarian ways in a frenzy of cannibalism; it all happens on the wild and wide-open landscape of South Africa.

The latitudes south of the Sahara offer vastly different battlegrounds for a wide range of warriors; male giraffes swing their heads like wrecking balls, zebras boast the most powerful kick in the animal kingdom, and chimpanzee warfare is familiar.

A high-tech autopsy on a Nile crocodile unlocks secrets behind its hunting prowess.

A look at the cold-blooded residents of Madagascar.

The Savanna's woodland of southern Africa is a unique ecosystem in the world. A great amount of branches and bushes have created a dark maze, where predators and preys are in a continuous state of tension. Visibility is little.