Busier than ever, Hope and the team struggle to handle the huge caseload; a volunteer helps an injured bird.

Ol Pejeta is in the shadow of Mount Kenya, but it has one of the most stunning sunrises in all of Africa.

The staff attempts to put radio transmitting collars on the lions to keep track of the population.

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

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

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.

Starting up a raccoon adoption agency; Hope tries to make peace between wild enemies; a kidnapped fawn needs to be reunited with its mother.

The park's hyena population grows.

Triggering the natural instincts of North African white rhinos prompts their return to the wild.

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.

Starting up a raccoon adoption agency; Hope tries to make peace between wild enemies; a kidnapped fawn needs to be reunited with its mother.

The park's hyena population grows.

Triggering the natural instincts of North African white rhinos prompts their return to the wild.

The desert of Chile is the driest in the world, but the marine currents are thought to be the richest on the planet; immense schools of fish swim under constant siege.

The interior of Brazil has ecosystems as different as dry forest and flood plains mix; this combination, which includes rivers, waterfalls and mountains, is home to a diverse and extremely rich fauna.

The Amazon River and its tributaries irrigate an ancient jungle full of life; the planet's largest eagle, the monkey-hunting harpy; tens of thousands of insects; several hundred kinds of fish.

The desert of Chile is the driest in the world, but the marine currents are thought to be the richest on the planet; immense schools of fish swim under constant siege.

The interior of Brazil has ecosystems as different as dry forest and flood plains mix; this combination, which includes rivers, waterfalls and mountains, is home to a diverse and extremely rich fauna.

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 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.

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

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.

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

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.

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.

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

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.

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.

Starting up a raccoon adoption agency; Hope tries to make peace between wild enemies; a kidnapped fawn needs to be reunited with its mother.

The park's hyena population grows.

Triggering the natural instincts of North African white rhinos prompts their return to the wild.

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.

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.

A new volunteer steps up to the challenge; Hope's first fawn of the year interrupts delicate surgery on an injured owl.

An attempt to discover what is killing off the black rhino, before it's too late.

Eight giraffes are moved to a newly opened wildlife area on an island.

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.

A new volunteer steps up to the challenge; Hope's first fawn of the year interrupts delicate surgery on an injured owl.

An attempt to discover what is killing off the black rhino, before it's too late.

Eight giraffes are moved to a newly opened wildlife area on an island.

A look at snow leopards in the central mountains of the Tibetan Plateau.

A feeding frenzy for hungry predators as the Great Migration arrives.

The Rockies are the spine of North America and are home to cougars, wolverines, wolves, and grizzly bears; Native American tribes compete in breakneck horse races and daredevil wingsuit flyers leap from mile-high cliffs.

A look at snow leopards in the central mountains of the Tibetan Plateau.

A feeding frenzy for hungry predators as the Great Migration arrives.

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.

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

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.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

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

A trio of Elephants in Zambia are rescued.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

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

A trio of Elephants in Zambia are rescued.

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.

A new volunteer steps up to the challenge; Hope's first fawn of the year interrupts delicate surgery on an injured owl.

An attempt to discover what is killing off the black rhino, before it's too late.

Eight giraffes are moved to a newly opened wildlife area on an island.

The Dawn mission explores the asteroid Vesta and dwarf planet Ceres.

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.

Humpbacks and whale sharks visit the coast of Mozambique.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

An agitated elephant ends up in a local village and the vets need to find a helicopter immediately.

The vets attempt to breed the rare Grevy's zebras while the more common zebras have to be moved.

Humpbacks and whale sharks visit the coast of Mozambique.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

An agitated elephant ends up in a local village and the vets need to find a helicopter immediately.

The vets attempt to breed the rare Grevy's zebras while the more common zebras have to be moved.

Hammerheads, Galapagos sharks, rays, and other species populate the waters of Cocos Island.

Stunning underwater video taken from the wildest expeditions of the world's greatest dive shops highlight the ocean's most spectacular species.

The Bahamas are surrounded by coral reefs and underwater caves with sharks, turtles, and dolphins.

Hammerheads, Galapagos sharks, rays, and other species populate the waters of Cocos Island.

Stunning underwater video taken from the wildest expeditions of the world's greatest dive shops highlight the ocean's most spectacular species.

When a great horned owl arrives covered in oil, Doctor Sherri must put it through a terrifying, life-saving procedure; boxes of young foxes need help and attention.

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

A trio of Elephants in Zambia are rescued.

Travelling to the Arctic for a peek at the brutal challenges of life in the boreal forest; admiring some stellar animal adaptations; witnessing a secret reindeer superpower; navigating a rodent labyrinth of snow.

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.

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.

Travelling to the Arctic for a peek at the brutal challenges of life in the boreal forest; admiring some stellar animal adaptations; witnessing a secret reindeer superpower; navigating a rodent labyrinth of snow.

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.

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.

Humpbacks and whale sharks visit the coast of Mozambique.

A hurricane slams the rehab, knocking an osprey nest out of its tree; Hope scrambles to save the babies in the middle of the storm.

An agitated elephant ends up in a local village and the vets need to find a helicopter immediately.

The vets attempt to breed the rare Grevy's zebras while the more common zebras have to be moved.

Scientists are now probing to detect gravity waves in space and mapping the gravity patterns of the moon for the first time.

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

A breath-taking journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the spectacular mountains to where the river meets the North Sea.

The rehab is up all night with three tiny orphans needing round-the-clock care.

Batian organizes a massive translocation of three species, but things don't go according to plan.

The red fox of Prince Edward Island.

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

The rehab is up all night with three tiny orphans needing round-the-clock care.

Discover how staff treat a wounded eland and reunite a hartebeest with her herd.

Two wild black rhinos fight to the death; a new ambassador for the black rhinos.

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.

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.

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.

Travelling to the Arctic for a peek at the brutal challenges of life in the boreal forest; admiring some stellar animal adaptations; witnessing a secret reindeer superpower; navigating a rodent labyrinth of snow.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The rehab is up all night with three tiny orphans needing round-the-clock care.

Discover how staff treat a wounded eland and reunite a hartebeest with her herd.

Two wild black rhinos fight to the death; a new ambassador for the black rhinos.

A breath-taking journey on Scotland's River Spey, traveling from its source in the Highlands, winding by boat through the spectacular mountains to where the river meets the North Sea.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

An in-depth look at the American shad on its epic journey upstream, back to its fresh water birthplace to spawn.

The bald eagle reigns supreme as the ultimate predator above the waters of Bras d'Or Lake on Canada's eastern shore.

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

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

Ol Pejeta is in the shadow of Mount Kenya, but it has one of the most stunning sunrises in all of Africa.

The staff attempts to put radio transmitting collars on the lions to keep track of the population.

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.

Giles cares for a sun bear cub while building a rescue center in Laos.

Giles helps two moon bear cubs and is shocked with news at the sanctuary.

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.

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 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.

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.

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.

The unlikely collaborators working to ensure mutual survival in the Kalahari Basin; an elephant clan's symbiotic link to fruiting anaboom trees, a meerkat's alliance with a feisty drongo bird, and more flora-and-fauna odd couples.

Thirst for rain alongside the animals of the Kalahari as elephant herds cooperate, and meerkat's adopt a strange babysitter in the depths of a brutally dry year.

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.

The unlikely collaborators working to ensure mutual survival in the Kalahari Basin; an elephant clan's symbiotic link to fruiting anaboom trees, a meerkat's alliance with a feisty drongo bird, and more flora-and-fauna odd couples.

Thirst for rain alongside the animals of the Kalahari as elephant herds cooperate, and meerkat's adopt a strange babysitter in the depths of a brutally dry year.

Pondering a doe's potential as a surrogate mother and the chances that two fawns have in the ER.

Ol Pejeta is in the shadow of Mount Kenya, but it has one of the most stunning sunrises in all of Africa.

The staff attempts to put radio transmitting collars on the lions to keep track of the population.

A journey along Ireland's longest river, the Shannon, through an emerald green landscape of rolling hills and sparkling waters; how Vikings, monks and kings have all made their mark.

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

Two tricky patients finally go free; 50 babies are born all at once.

Batian organizes a massive translocation of three species, but things don't go according to plan.

The red fox of Prince Edward Island.

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

Two tricky patients finally go free; 50 babies are born all at once.

Batian organizes a massive translocation of three species, but things don't go according to plan.

The red fox of Prince Edward Island.

Arthropods were the first animals to conquer the land and seas nearly 550 million years ago; the largest phylum in the animal world including insects, spiders and crustaceans, their jointed legs gives them the appearance of marauding machines.

The arachnids are endlessly surprising creatures that together form a hugely diverse group of gifted predators replete with mysterious marvels, armed with amazing weapons and possessing almost inexplicable powers.

Armed with the most extreme senses: soundless flight, dagger-like talons and steely beaks, owls possess the necessary weapons for attacking victims in the depth of darkness.

Arthropods were the first animals to conquer the land and seas nearly 550 million years ago; the largest phylum in the animal world including insects, spiders and crustaceans, their jointed legs gives them the appearance of marauding machines.

The arachnids are endlessly surprising creatures that together form a hugely diverse group of gifted predators replete with mysterious marvels, armed with amazing weapons and possessing almost inexplicable powers.

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.

Travelling to the Arctic for a peek at the brutal challenges of life in the boreal forest; admiring some stellar animal adaptations; witnessing a secret reindeer superpower; navigating a rodent labyrinth of snow.

Learn how plants and animals tough it out in some of the driest terrain Earth has to offer. Run across thirsty trees that act as elephant signposts, see insects team up with plants for a chance at life, and get insight into natural chemical warfare.

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.

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.

In a South African sanctuary, Liz meets a nine-year-old lion called Ricci whose teeth are in such rough shape he can't eat; specially trained vets use unique tools and slightly more anaesthetic than estimated on the wakeful patient.

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.

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.

In a South African sanctuary, Liz meets a nine-year-old lion called Ricci whose teeth are in such rough shape he can't eat; specially trained vets use unique tools and slightly more anaesthetic than estimated on the wakeful patient.

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

Two tricky patients finally go free; 50 babies are born all at once.

Batian organizes a massive translocation of three species, but things don't go according to plan.

The red fox of Prince Edward Island.

The vast majority of information being gathered about Mars is by orbiters chronicling everything they can.

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

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

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

An in-depth look at the American shad on its epic journey upstream, back to its fresh water birthplace to spawn.

The bald eagle reigns supreme as the ultimate predator above the waters of Bras d'Or Lake on Canada's eastern shore.

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

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

An in-depth look at the American shad on its epic journey upstream, back to its fresh water birthplace to spawn.

The bald eagle reigns supreme as the ultimate predator above the waters of Bras d'Or Lake on Canada's eastern shore.

Africa's trees provide food, shelter, and opportunities for its creatures.

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 Great Elephant Tale follows three stories: a calf navigates the Okavango Delta; a bull searches for a mate; and a matriarch leads her family through the desert. These individual adventures tell the story of Africa's most iconic species.

Africa's trees provide food, shelter, and opportunities for its creatures.

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.

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.

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.

In a South African sanctuary, Liz meets a nine-year-old lion called Ricci whose teeth are in such rough shape he can't eat; specially trained vets use unique tools and slightly more anaesthetic than estimated on the wakeful patient.

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.

Track scientists arrive in the Kalahari to test the hypothesis that animal collaboration is the key to the dizzying diversity of the region's species; they monitor behavior, decipher data, and deliver conclusions.

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.

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.

Track scientists arrive in the Kalahari to test the hypothesis that animal collaboration is the key to the dizzying diversity of the region's species; they monitor behavior, decipher data, and deliver conclusions.

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.

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

Hope and Dr. Barry break ground on new chapters in their life, Hope rebuilding the rehab and Dr. Barry setting out on his own.

An in-depth look at the American shad on its epic journey upstream, back to its fresh water birthplace to spawn.

The bald eagle reigns supreme as the ultimate predator above the waters of Bras d'Or Lake on Canada's eastern shore.

Examining the science behind the birth of the universe.

Mercury, one of the nearest planets to earth, has eluded astronomers' best efforts to learn its secrets until missions like Mariner and Messenger.

Sharks may be much more intelligent than previously thought.

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

Sharks may be much more intelligent than previously thought.

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

An enormous territory of endless plains that changes its appearance twice a year, some times appearing flooded, other times looking nearly desiccated; a place of highly contrasting landscapes; the capybara.

A wild, jungle world lives on the shores of the Caribbean Sea; within the various channels of the tropical rivers, alligators and crocodiles swim and the fearsome jaguar searches for turtles on the region's virgin beaches.

As its name suggests, storms dominate the rainforest, with rain falling more than three hundred days a year; hundreds of species live in each layer of this jungle.

An enormous territory of endless plains that changes its appearance twice a year, some times appearing flooded, other times looking nearly desiccated; a place of highly contrasting landscapes; the capybara.

A wild, jungle world lives on the shores of the Caribbean Sea; within the various channels of the tropical rivers, alligators and crocodiles swim and the fearsome jaguar searches for turtles on the region's virgin beaches.

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.

Track scientists arrive in the Kalahari to test the hypothesis that animal collaboration is the key to the dizzying diversity of the region's species; they monitor behavior, decipher data, and deliver conclusions.

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.

Wildlife and the environment.

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.

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.

Wildlife and the environment.

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.

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.

Sharks may be much more intelligent than previously thought.

Hope's open house is bigger than ever; a mysterious visitor leaves a big impression.

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.

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

The Fermi Paradox asks why another civilization has not presented itself.

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

Animals that survive in cities.

Cape Breton Highlands National Park faces destruction by various species.

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

Animals that survive in cities.

Cape Breton Highlands National Park faces destruction by various species.

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.

The Andes is the longest mountain range in the world and home to astonishing hidden worlds, extraordinary animals and remarkable people. Featuring a puma hunt, bears searching for water in scorched forests and a newly discovered shapeshifting frog.

An astonishing range of wildlife is attracted to the Pantanal's Rebel Lake - including 600-pound tapirs, jaguars, graceful spoonbills, and hundreds of caimans.

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.

The Andes is the longest mountain range in the world and home to astonishing hidden worlds, extraordinary animals and remarkable people. Featuring a puma hunt, bears searching for water in scorched forests and a newly discovered shapeshifting frog.

Wildlife and the environment.

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.

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.

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

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

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

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

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

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

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

Endangered bats need Hope's help, but it means taking unusual steps; Hope's deer release has a bumpy start.

Animals that survive in cities.

Cape Breton Highlands National Park faces destruction by various species.

Examining Landsat 8, the advanced planetary explorer with a 900 million dollar price tag, which is designed to reveal complex and ever-changing details undetectable by the human eye.

A vehicle the size of a small car spent a year on Mars.

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

The worst winter in 100 years causes big problems.

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

The complicated relationships of crustaceans.

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

The worst winter in 100 years causes big problems.

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

The complicated relationships of crustaceans.

Clear waters, deep reefs, and dangerous caves.

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.

Clear waters, deep reefs, and dangerous caves.

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

Hope's team struggles to help two rescued harp seals learn the natural behaviors they will need to survive in the wild.

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