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.

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.

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

The complicated relationships of crustaceans.

Exploring the wild blue caribbean waters of cozumel, from the paso del cedral coral reef to the world's longest subterranean underwater cave system.

Home to the world's second-largest barrier reef, Roatan is one of the world's top dive spots - known for its rare black corals, low-lying nurse sharks and fearsome-looking barracuda.

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.

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.

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

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.

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.

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

Taking a journey through the eyes of catfish, ocelots, and other native creatures, celebrating the Lone Star State's landscapes and wildlife, and looking at how crucial conservation efforts can save Texas' unique habitats.

Eoin starts his island voyage on Rathlin, then heads west for Malin Head and Inishtrahull meeting Basking Sharks and Dolphins en route, before going south to Achill Island and the story of the Irish Stoat.

Eoin visits a wondrous native woodland on Clare Island and as he sails his Galway Hooker through Connemara's turquoise waters he finds deserted islands home to skylarks and on the Aran Islands, Ireland's only native reptile.

Eoin is back in his Galway Hooker and sailing to the islands off County Kerry before heading south into his home waters off Cork and the end of his journey at Fastnet Rock.

Find good magic, and visit the dark side of the world's tropical forests.

Observe the natural and human forces that have shaped Ningaloo Reef, Cape Range, and Exmouth Gulf with Tim, Traditional Owners, and other experts. Check out a million-year-old fossil reef, a gargantuan fish, and a ray that packs quite a punch.

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.

Explore the partnership between clownfish and anemones; watch oxpeckers keep savannah residents healthy; review the agreements of dung beetles and pitcher plants.

A comprehensive overview of the mind-boggling character traits exhibited by different species of animals when it comes to mating.

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.

Explore the partnership between clownfish and anemones; watch oxpeckers keep savannah residents healthy; review the agreements of dung beetles and pitcher plants.

A comprehensive overview of the mind-boggling character traits exhibited by different species of animals when it comes to mating.

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.

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

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.

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.

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

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

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

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

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; meeting some real-life swamp monsters.

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; watch an aromatic tree bring together blossom and possum in a moonlit tryst.

Admire arctic animals' secret superpowers of survival.

Unlock survival strategies in Earth's most arid climates.

Explore the partnership between clownfish and anemones; watch oxpeckers keep savannah residents healthy; review the agreements of dung beetles and pitcher plants.

A comprehensive overview of the mind-boggling character traits exhibited by different species of animals when it comes to mating.

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.

Introducing passionate animal lovers to the orphaned cubs at Black Bear Rescue Manitoba, offering a unique opportunity to follow adorable orphaned black bear cubs, from the moment they're rescued to the day they're released into the wild.

Tangle with a leopard; exploring mealtime hierarchy and witnessing a sad vigil.

Grieving the lost Kakumbi pups; the Manzi pack repels big predators.

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.

Introducing passionate animal lovers to the orphaned cubs at Black Bear Rescue Manitoba, offering a unique opportunity to follow adorable orphaned black bear cubs, from the moment they're rescued to the day they're released into the wild.

Tangle with a leopard; exploring mealtime hierarchy and witnessing a sad vigil.

Grieving the lost Kakumbi pups; the Manzi pack repels big predators.

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.

Escape with us on a thrilling journey down the river that forged North America ... the St. Lawrence. From the grandeur of the Great Lakes to the picturesque 1000 Islands and through the vibrant, historic cities of Montreal and Quebec. Past rugged landscapes and into the world's largest estuary. To sailors, kayakers and whale watchers the river is part playground, part paradise. Sailing by castles, diving for shipwrecks and rowing the open water.

Canada's east coast experiences all four seasons.

Overpopulation of deer in Hampton, N.B.

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

Cabo Pulmo is the site of an extraordinary marine recovery.

The island nation of Palau created the first shark sanctuary and the largest marine sanctuary.

Dr. Barry gets married; an eagle needs surgery; Hope releases the deer that arrived as fawns.

Navigating the historic Potomac River from West Virginia to Chesapeake Bay, passing through Washington, D.C. and the national monuments and ending at George Washington's Mount Vernon estate.

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

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.

Dr. Barry gets married; an eagle needs surgery; Hope releases the deer that arrived as fawns.

Giant hornets, honeybees and yellow jackets battle for territory.

Investigating the different reasons that lead animals to face tough disputes.

Family is everything, at least to a good number of animals; many species live in families, clans or groups; the survival of each individual depends on the family, and the family depends on the union of all its components.

The most elemental and pure survival is based on eating; if an animal is not healthy, strong, and agile, they cannot compete to mate, defend their family from any threat, nor will they be able to achieve good status in their clan.

The love rivalry shakes every fiber of the body as hormones invade the blood, and some of the most overwhelming spectacles on the planet are produced; the language of love and the fight for reproduction stimulate the most diverse behaviors.

Introducing passionate animal lovers to the orphaned cubs at Black Bear Rescue Manitoba, offering a unique opportunity to follow adorable orphaned black bear cubs, from the moment they're rescued to the day they're released into the wild.

Tangle with a leopard; exploring mealtime hierarchy and witnessing a sad vigil.

Grieving the lost Kakumbi pups; the Manzi pack repels big predators.

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

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; watch an aromatic tree bring together blossom and possum in a moonlit tryst.

The dance between predator and prey keeps nature in perfect harmony.

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.

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; watch an aromatic tree bring together blossom and possum in a moonlit tryst.

The dance between predator and prey keeps nature in perfect harmony.

Navigating the historic Potomac River from West Virginia to Chesapeake Bay, passing through Washington, D.C. and the national monuments and ending at George Washington's Mount Vernon estate.

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

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.

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

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

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

Fascinating creatures thrive in the muck.

Hope is taking on more animals and more responsibilities, but there are concerns about Hope's own health.

The people of Nunavik prepare for the coming winter.

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.

Hope is taking on more animals and more responsibilities, but there are concerns about Hope's own health.

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.

The hunt for Goliath tigerfish, one of the deadliest freshwater predators on the planet.

Lions, hyenas and a wily leopard battle each other and the harsh surroundings of Savute, Botswana.

A massive migration in East Africa passes two major rivers with hungry crocs.

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.

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; watch an aromatic tree bring together blossom and possum in a moonlit tryst.

The dance between predator and prey keeps nature in perfect harmony.

Exploring the unique evolutionary journey of woodpeckers and the role they play in every ecosystem, except Antarctica and Australia.

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.

Exploring the unique evolutionary journey of woodpeckers and the role they play in every ecosystem, except Antarctica and Australia.

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.

The people of Nunavik prepare for the coming winter.

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.

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

Sharks are at risk in Costa Rica.

The Wild Coast of South Africa, stretching 170 miles from East London to the KwaZulu-Natal border, is comprised of rivers that empty into the sea and indigenous forest.

The coastline of Mozambique attracts some of the world's largest filter feeders; Two of Mozambique's leading marine researchers, Andrea Marshall and Nakia Cullain, set out to find one of the ocean's most secretive animals.

An old patient gets a second chance; a pregnant porcupine; Hope has surgery.

Ninginganiq is so dangerous that even seasoned sailors keep away.

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.

An old patient gets a second chance; a pregnant porcupine; Hope has surgery.

Winter in Marakele National Park is one of the scarcest, but also most plentiful, times of the year; looking at how a giraffe's demise becomes a source of life for the region's vultures, who depend on the decaying flesh of animals like these.

Cape Town, South Africa is home to twenty types of frogs, but many are threatened by urban development; following western leopard toads on their tenuous journey to breed in the city's shrinking wetlands.

Once superabundant, African Elephant populations have declined drastically due to hunting; getting an in-depth look into the lives of these powerful land mammals, and seeing what parks like Addo and Tembe are doing to preserve their future.

Surviving the African savanna requires guile and teamwork for species who live in packs; following a day in the life of African wild dogs and dwarf mongooses to see how they rely on their tight-knit families to overcome the challenging landscape.

From a tick-infested rhino to the freshwater turtles who nip the insects off the giant beast, all life is connected; following the complex web of relationships between these species and more to see how each creature fits into one magical whole.

Exploring the unique evolutionary journey of woodpeckers and the role they play in every ecosystem, except Antarctica and Australia.

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.

Learn the secrets of the most powerful, capable birds in the sky. Follow the dramatic story of a family of bald eagles, then join avian specialist Lloyd Buck as he puts his trained golden eagle to the test in a series of remarkable experiments.

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.

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

Learn the secrets of the most powerful, capable birds in the sky. Follow the dramatic story of a family of bald eagles, then join avian specialist Lloyd Buck as he puts his trained golden eagle to the test in a series of remarkable experiments.

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.

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

Ninginganiq is so dangerous that even seasoned sailors keep away.

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.

Humpbacks and whale sharks visit the coast of Mozambique.

Plankton are the basis of the world's largest food web.

The great white shark is one of the most iconic ocean creatures.

Sharks may be much more intelligent than previously thought.

Hope visits two long-term patients; tough choices; a unique creature joins the rehab.

The Everglades during the winter season.

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.

Hope visits two long-term patients; tough choices; a unique creature joins the rehab.

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.

Exploring the bizarre mating rituals of the ocean's most peculiar creatures; learning how bloody battles for mates, gender bending, and super-size litters of babies might secure a next generation for these animals.

In every society there is the female or male Alpha; through different animal families, discovering that being an Alpha implies responsibility, leadership and cultural transmission; a leader is responsible for the pack's success or its extinction.

In September, one side of Sri Lanka is drenched in monsoons, while the other withers in drought, creating two different habitats and diversity of life.

Learn the secrets of the most powerful, capable birds in the sky. Follow the dramatic story of a family of bald eagles, then join avian specialist Lloyd Buck as he puts his trained golden eagle to the test in a series of remarkable experiments.

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.

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

Learning how to chill out tense cats with Alice, then spotting red flags for dog aggression with Judy; looking at the latest research on fish-based feline foods with Steve, and finding out how to take care of intelligent African grey parrots.

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.

In Kafue National Park, a team of biologists and vets from the Zambian Carnivore Programme, races to save and protect Africa's apex predators.

Learning how to chill out tense cats with Alice, then spotting red flags for dog aggression with Judy; looking at the latest research on fish-based feline foods with Steve, and finding out how to take care of intelligent African grey parrots.

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.

In Kafue National Park, a team of biologists and vets from the Zambian Carnivore Programme, races to save and protect Africa's apex predators.

The Everglades during the winter season.

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.

A survival story following the adventures of a she-wolf as she travels across the Alps searching for a safe place to bring up her cubs.

Sizing up a primate no bigger than a mouse, a chameleon that fits on a fingertip and other minuscule creatures with biologist Patrick Aryee; learning why being tiny can be an advantage; some ingenious adaptations to life's big challenges.

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.

Waters flood the prairies, mangroves and marshes.

A dramatic repair mission gives the Hubble Space Telescope another chance to capture stunning pictures like only it can.

In the future, telescopes will allow scientists to see further to planets that may support life.

In an attempt to view the cosmos beyond the scope of human vision, infrared light and gamma radiation are used.

Advanced telescopes capture images of the night sky from the Atacama Desert.

Bizarre creatures of the sea.

Evolution can create amazing bodies.

Strange creatures that look fabricated.

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

Bizarre animals thrive in Madagascar.

Lemurs have colonized every available habitat in Madagascar.

Forest inhabitants of Madagascar.

Chacma baboons in South Africa may be under threat from a growing rival troop.

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

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

Ascending to new heights in pursuit of the wily mountain goat; discovering the best-kept secrets of these nimble climbers, whose capable hooves and perfectly adapted anatomy make even the best-equipped mountaineer jealous.

Soaring above the Iberian Peninsula for a closer look at the griffon vulture: the biggest, most aggressive of the region's carrion raptors; glimpsing nests where baby vultures are nurtured for up to six months.

Following a pack of wolves across the wilds of the Iberian Peninsula; gaining a new understanding of their athleticism; tracking their progress on long-distance hunts; observing sprinting speed and their hunting tactics.

Going undercover to meet the ever-changing chameleon, a master of disguise with amazing physical prowess; a close look at Juan Antonio's sketchbook depicts this lizard's secrets, including enhanced vision, sticky feet, and a prehensile tail.

A trek across Africa to peek at the colorful, quirky survival strategies of its animals; from flamboyant flamingos to vanishing lizards, these furry, feathered, and scaled magicians find food, elude predators, and find mates against all odds.

Ascending to new heights in pursuit of the wily mountain goat; discovering the best-kept secrets of these nimble climbers, whose capable hooves and perfectly adapted anatomy make even the best-equipped mountaineer jealous.

Soaring above the Iberian Peninsula for a closer look at the griffon vulture: the biggest, most aggressive of the region's carrion raptors; glimpsing nests where baby vultures are nurtured for up to six months.

Following a pack of wolves across the wilds of the Iberian Peninsula; gaining a new understanding of their athleticism; tracking their progress on long-distance hunts; observing sprinting speed and their hunting tactics.

Going undercover to meet the ever-changing chameleon, a master of disguise with amazing physical prowess; a close look at Juan Antonio's sketchbook depicts this lizard's secrets, including enhanced vision, sticky feet, and a prehensile tail.

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

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.

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.

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.

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

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

The Northern Lights tells the story of the makeup of the planet, the sun and possibly life on other planets.

Using computer simulations, it is possible to fly over other worlds and see how galaxies interact.

The second largest planet is also a mini-solar system with 60 moons and those crazy rings.

Lunar and solar eclipses.

Animals have evolved different chemical weapons, from paralyzing venoms to necrotic toxins.

Animals that have evolved unusual abilities.

Some survival adaptations make creatures ugly.

The survival adaptations of creepy crawlers.

Penguin populations of Australia.

A look into the lives of emus.

A look at various airborne hunters.

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

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

Many iconic mainland fauna also live on Kangaroo Island.

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

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

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 trek across Africa to peek at the colorful, quirky survival strategies of its animals; from flamboyant flamingos to vanishing lizards, these furry, feathered, and scaled magicians find food, elude predators, and find mates against all odds.

Discover the stories of six epic river journeys via the fascinating characters who live and work on and around the water.

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.

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.

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

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

The search for water is actually the search for life, and that search is taking man to some unusual places, including a moon of Saturn.

For more than 25 years, the shuttle was our ticket to space and our laboratory in orbit.

Exploring the Milky Way from the mythology of ancient sky watchers to how scientists are mapping it from the inside out.

Examining how cosmic rays are produced and what that can tell us about the universe.

Some of the largest and unusual insects.

Interesting types of camouflage and coloration in animals.

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

Bizarre birds have various adaptations.

Geladas are found among the peaks and plateaus of Ethiopia's Simien Mountains.

Primates, like lemurs and baboons, display adaptability and resilience in their day-to-day lives on their quest for food and shelter.

The baboon has adapted to become one of Africa's most successful and dominant primates.

Red Colobus Monkeys on the island of Zanzibar.

Aliwal and Sodwana, the Dune Kingdoms.

Cape fur seals breed on Africa's west coast.

Mafia Island, located just off the Tanzanian coastline, is home to diverse marine and terrestrial ecosystems with miles of white beach and clear waters.

The species that call Lake Malawi home have evolved.

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.

Exploring the bizarre mating rituals of the ocean's most peculiar creatures; learning how bloody battles for mates, gender bending, and super-size litters of babies might secure a next generation for these animals.

The Oceanic White-tip shark has been called the most dangerous of all sharks; in two disasters during WWII 1,000 sailors perished in its jaws.

Elk and moose live beside bears and wolves where the mountains cross international borders.

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.

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.

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.

Elk and moose live beside bears and wolves where the mountains cross international borders.

Animals living in the harsh conditions of the mountain peaks.

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

Marine protected areas in Florida.

Across the continent, the land and its wildlife breathe in warmth and renewal; for some animals, courtship rituals begin to heat up as battles for dominance break out; for others, it's the time to tend to brand new life.

Summer is the time of plenty across America; it's a chance for animals to reap nature's bounty while they can; the year's young begin to explore their world, while new parents make use of the long days to make sure they grow up strong.

In Autumn, change sweeps across America; as the trees greet the chill with a blaze of color, it's make or break time for animals; time to pull up stakes, make last minute preparations, and often find a mate before the cold sets in.

Winter is the ultimate challenge. As temperatures plunge across much of America, some animals escape to milder climes of the South, while others stay put and tough out the brutal cold and blizzards that blanket the North.

Arctic winds plunge the polar bear into a deep freeze, while in Australia, the heat means a feast for one bird prey.

Travel around the globe to witness the atmospheric shifts that take place in March, from the wave of cherry blossoms that unfold across Japan to the final raft of green sea turtles that arrive on the Great Barrier Reef islands to lay eggs.

May brings violent tornados to North America and the life-giving monsoon to India; the dry season ends in southern Africa, claiming victims among elephants.

In July, Arctic ice sheets crash into the sea while an arctic fox hunts among the rocks. In Africa, herds wildebeest cross the croc-infested Mara river.

In September, seasonal swings activate change across the natural world.

Coming full circle on this wild year on Earth.