Transformers: These creatures may look cute and cuddly but, beware, when challenged, threatened or hungry, they can morph into spine-chilling killer machines.

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Hump Day: Dr Oakley must hold her ground when she treats two rather unpredictable boars. Plus, a camel needs neutering and some baby owls get their first check up. (S5, ep 6).

One Way or an Otter: A resident black bear preps for winter hibernation, an orphaned sea otter is bottle-raised, and a rare hawk fights for survival. (S2, ep 8).

Lost Lake Dinosaur: Cyril's next mission is the invasive paiche - a giant, air-breathing monster fish that can grow to twice the length of an adult human. (S3, ep 8).

Lucky Ducky: The docs help huskies and treat some huge, 100 pound snakes as a pig uses a hairdryer and a calf gets schooled. (S2, ep 4).

One Great Dane: It's an emotional time as the team say farewell to their beloved Great Dane, Frija. Plus, the vets treat an uncooperative German shepherd and an adorable kitten. (S6, ep 8).

All Paws on Deck: The Docs at Critter Fixer tackle a litter of French Bulldog pups, a goat needing blood, and a donkey with a unique injury. (S3, ep 11).

A tropical reef may look peaceful, but in reality, it is a dog-eat-dog world where Dolphins rule and everyone else must run for cover. Learn about the ways aquatic life survive the reef.

Olympic River Run: Out of the Pacific Ocean rises the rugged coastline, rain-soaked forests and soaring summits of the Olympic Peninsula - all of which are teeming with wildlife. (S2, ep 4).

Hiss and Hers: The zookeepers are kept busy by the birth of a white rhino, two young lions leaving home and two cannibalistic snakes going on some high-stakes dates. (S1, ep 4).

Sprain, Sprain Go Away: The veteran docs don't skip a beat as they deal with stumbling emus, bruised colts, limping pigs and infected dogs. (S10, ep 2) RATING: NU7.

Office Nightmare. Simon makes a gruesome discovery in a shipping container after workers stumble on a black mamba. An office goes into lockdown when staff spot a green snake. (S4, ep 4).

Mandrill of the House: An older male mandrill shows his true colours during a dental exam. Plus, teamwork is critical as a gigantic female bison gets a physical. (S2, ep 18).

Heartlands: Iconic creatures thrive in the remote inland habitats of the Mediterranean - but for all species, raising the next generation is the ultimate goal. (S1, ep 1 of 2).

Untamed Coasts: A wealth of wildlife, including some of the world's most remarkable survivors, call the serene waters along the Mediterranean coastline home. (S1, ep 2 of 2).

Call of the Wolf: Nature's rewards shift with the change of seasons. Join the Alaskans as they seek out nature's carrot while anticipating its stick. (S5, ep 11).

Black Ice Battle: When a stuck truck blocks a main road, Thord has to rescue it - but the driver doesn't want to pay, so Thord threatens him with house arrest. (S5, ep 5).

Bone Crushers: Asian tigers and Arctic bears take centre stage in these bone-shattering clashes. There are no rules in these extreme animal battles. (S5, ep 8).

Fresh Bait: Cyril and his team hear from local fishermen about a distant jungle lagoon home to true giants, including tarpon. But getting there won't be easy. U. (S2, ep 6).

Show Me the Bunny: Broken toes, worm infestations and nursing puppies create a whirlwind of patients at Pol Vet this week, but the team are short-handed. (S6, ep 9).

One Way or an Otter: A resident black bear preps for winter hibernation, an orphaned sea otter is bottle-raised, and a rare hawk fights for survival. (S2, ep 8).

Most Wanted: Carnivorous fish feast on a river rat, a mother bear defends her cubs by any means necessary, and a pod of killer whales live up to their name.

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Wily Coyote: Dr Oakley is in for surprise when she comes face to face with a rather shrewd coyote. Plus, a seal pup needs emergency surgery if he is ever to see the ocean again. (S5, ep 7).

By Land: Two muskox arrive at the conservation center, while wood bison and foxes move to new homes, and a moose injury sends a keeper into a pond. RATING: AA (S1, ep 7).

Green Goliath: Experts scour the Pacific Northwest in search of the endangered and elusive green sturgeon, a monster fish that can grow to seven-feet long. (S1, ep 1).

Life Graft: Dr Hodges performs a medical miracle on a dog, Dr Ferguson conquers his fear of chickens, and the Docs dodge death rolls to aid gators. (S2, ep 5).

Show Me the Bunny: Broken toes, worm infestations and nursing puppies create a whirlwind of patients at Pol Vet this week, but the team are short-handed. (S6, ep 9).

Cat-Astrophe: At Critter Fixer, the Docs hunt for a missing product in three dogs, perform surgery on a tiny chinchilla, and help a stray kitten. (S3, ep 12).

Maui Mayhem: The team investigates incidents off Maui in peak tourist season to discover why the island has more shark encounters than the entire Hawaiian chain. (S1, ep 6).

of Change. Head inside America's most visited national park. A mecca for 9 million outdoor lovers a year, it's known for its joyful spring flowers and colourful autumn trees. (S2, ep 5).

Giraffic Park: The zoo welcomes a timid, new giraffe to the herd as a pregnant bat prepares to give birth and devoted keepers care for an epileptic chimp. All ages. (S1, ep 5).

Supe-Pol-Sticious: It's Friday the 13th, and the vets are fully equipped to handle the odd and unusual cases that arrive. RATING: NU7 (S10, ep 3).

Monster Under the Bed: Snakecatchers Simon and Siouxsie race to the rescue when a huge black mamba is found in a child's bed. Later, a deadly spitting cobra turns on Siouxsie. (S4, ep 5).

The Otter Limits: Baby otters learn how to swim as they become the Zoo's newest ambassadors and have their TV debut. Meanwhile, Clark the Cougar's future gets brighter. (S2, ep 19).

Deadly Rivals: A litter of wild dogs find their young lives on the line when a clan of hungry hyenas move in nearby. (S3, ep 5).

To survive in South Africa, nature produces exotic fauna, including both giant and pygmy versions of common species to occupy challenging niches.

Highwater Harvest: It's spring and by hell or high water the next generation will stop at nothing to replenish their vital meat stores and reap nature's bounty. (S5, ep 12).

Gridlock Hazard: Thord struggles to rescue a truck blocking a mountain pass while impatient drivers put his life in danger. (S5, ep 6).

Blood Feud: Witness some of the deadliest battles in the animal kingdom as creatures clash to protect their young or pass on their bloodlines. (S6, ep 1).

Lost Island Predators: Cyril and the team brave perilous jungles, toothy predators and slippery volcanic rocks in order to help save French Polynesia's giant trevally. U. (S2, ep 7).

Oh, Pol-Y Night: It's Christmas season in Michigan and Dr Pol and his team treat Tink and Lola, two dogs who are desperately in need of help. (S6, ep 10).

By Land: Two muskox arrive at the conservation center, while wood bison and foxes move to new homes, and a moose injury sends a keeper into a pond. RATING: AA (S1, ep 7).

War of the Carnivores: Tiger takes on tiger, alligators go jaw to jaw and lions face off against hyenas in a ferocious look at nature's eternal war. (S6, ep 1).

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Big Love: A surprising look at unusual animal friendships, including a remarkable bond between a tiger and a lion and giant rabbit that's brought great happiness to a cat. (S5, ep 5).

All Paws on Deck: The Docs at Critter Fixer tackle a litter of French Bulldog pups, a goat needing blood, and a donkey with a unique injury. (S3, ep 11).

Hiss and Hers: The zookeepers are kept busy by the birth of a white rhino, two young lions leaving home and two cannibalistic snakes going on some high-stakes dates. (S1, ep 4).

Charles in Charge: After handling a cow with a twisted stomach and a complicated foal delivery, Dr and Mrs Pol head off to their much needed vacation. (S3, ep 2).

Grandma Knows Best: Dr Oakley treats a limping bison and a litter of puppies struggling to survive. (S11, ep 4).

The Pug We Love: Join Dr Oakley as she tries to outsmart a herd of bison and fights for the life of a cherished friend. (S11, ep 5).

The heart of Uganda is a wonderland for wildlife, but perils await even in paradise.

All-Nighter: When a truck smashes into a barrier, Thord and Bjoern work into the small hours to save its cargo. Jo is called out of his bed to rescue a truck buried in snow.

Overload: Severe winter weather brings chaos to the mountains and Thord's running out of options.

Big Mamma Mamba: Simon has a close shave with a pregnant black mamba looking to lay her eggs. RATING: NU7 (S7, ep 6).

New Blood: When a mechanic spots an enormous black mamba disappear into a scrap heap, Simon and Sioux put their new apprentice to the test. U. (S8, ep 1).

The Eagle has Landed: Despite challenging weather conditions, Drs Ben and Erin Schroeder treat a wild bald eagle that needs immediate care before returning to the wild. (S3, ep 3).

Polar Delivery: Meet an adorable baby Rhino, witness an amazing polar bear birth and comfort a rare bird named Marla (S3, ep 6).

The Hissing Lynx: Two baby white rhinos join the herd at The Wilds, a pair of red pandas have a blind date in a tree, and a super-cute tortoise baffles its doctors. RATING: AA (S3, ep 7).

More than a mere holiday destination, the islands, mountains and forests of the Croatian coast reveal a world of unexpected wildlife and treasures.

Storm of Snakes: Simon and Siouxsie risk it all to save a black mamba in a storm. Plus, a cobra launches a sneaky attack and a huge spitter squares up to a tiny dog. 12+. (S5, ep 2).

Last Flat Day: As the residents spend time and energy to get results before winter, Matt and Carl get ready for an epic journey and Oliver chases after deer. 12+. (S6, ep 15).

This Must Be the Place: With the help of neighbours Carl and Morgan, novice crabber Matt Carlson breaks in his new boat in an iceberg minefield. 12+. (S6, ep 16).

Tunnel of Love: As the sea lions rejoice over the long-awaited opening of Adventure Cove, a tiny loris and beloved iguana present strange mystery illnesses. U. (S5, ep 3).

Holey Batwings: As a newborn sea lion pup struggles to stay alive, a bat confronts his holey wings and a zebra named Holly hits the spa! U. (S5, ep 4).

Mush Madness: Follow vet Dr Michelle Oakley as she tends to the Yukon's vast animal population. First up is a feral cat, a fearsome muskox and a former sled dog champion. (S2, ep 1).

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Moo in Town: New vets Dr Lisa and Dr Ray take the reins and show off their veterinary skills and are challenged by a baby calf in need of assistance. (S9, ep 16).

Fairy-Y Dogmother: The docs have their hands full with a champion dairy feeder in need of a last-minute emergency, and a goat that's giving Dr Pol a headache. (S9, ep 17).

Desert Survivors: In Mongolia's sizzling Gobi desert, many animals have evolved to live with little water. But that doesn't mean surviving is easy. (1 of 3).

Rise of Exiles: The wild dogs pick a replacement for their murdered leader. The exiled pride fight to protect their cubs and the marauding hyenas commit the cruellest of acts. (S3, ep 3).

War Games: Mmamotse has turned the kingdom upside down but her legacy now depends on a princess taking the throne. Dikeledi prepares her cheetah cubs to cross enemy territory. (S3, ep 4).

Dr Neil Hammerschlag and his team go in search of the Great Hammerhead - a shark that can grow up to 20 feet in length and can weigh over 1,000 pounds.

Around the world, Orcas have been attacking great whites. Shockingly, when these attacks occur, other sharks start to move away. Are they communicating with each other about the attacks.

From their massive size, strength and stamina to their finely tuned hunting skills and unrelenting will to survive, sharks have evolved to be the perfect predator.

Fangs for the Memories: The Florida team fight to keep their most critical injured and orphaned manatees alive, as a growing Siamang declares her independence. (S3, ep 11).

Monkey Business: As a team of doctors rush to a leopard's side, a monkey gets a rare physical, birds take cover from avian flu and a newt species gets a second chance. U. (S3, ep 12).

Pugs in a Blanket: The Docs at Critter Fixer bet the farm on some risky bids at a local cow auction and check on a pregnant pug and afterward, her new pups. (S4, ep 3).

In Italy and Croatia, efforts to save a rare species of bear are helping many other animals to thrive and landscapes to flourish.

A British team search for a huge 12-metre, 200kg squid. It's a super-sized sea serpent that may have terrorised sailors for centuries, but finding and filming it will be no easy task.

Off the coast of Mauritius lives a family of sperm whales. Are you ready to join their clan and discover the everyday habits that make up their extraordinary lives.

Discover the ancient landscape of northeastern Australia, the most biodiverse region on the continent, and meet the incredible species struggling to survive there. U.

Simon and Siouxsie throw their lives on the line to get a deadly snake out of a sofa. They also help a man who didn't know he was room sharing with a mamba. 12+.

Winter's Test: Despite deadly freezing winter temperatures, Alaskans must explore new territories by any means necessary in order to live another day. All ages.

Deadman's Dilemma: When temperatures drop to all-time lows, the Alaskans must battle the harsh elements in order to secure basic necessities. 16+.

Red Panda Drama Mama: A naughty red panda mum makes a play for attention, a moose struggles with a nasty cough and a cherished cheetah hits a milestone! U.

Giraffe-Ic Park: This week at the zoo: it's raining baby giraffes, Dr Priya gives Connie the elephant an eye exam and two camel brothers embark on a new life. U.

Time is of the essence when Dr Oakley is called to Quebec to help a team of scientists battling to save a unique caribou herd from being wiped out.

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Dr Oakley gets more than she bargained for when she checks on a herd of reindeer. Plus, two foxes get their jabs and a moose's big belly gives cause for concern.

The Alaska Raptor Center rescues two severely-injured eagles, and they take in a raven covered in fish guts.

The team investigates reports of man-eating freshwater sharks found in Florida's Indian River and more than 2,000 miles upriver in the Amazon.

Tooth Be Told: Parasite-plagued alpacas arrive in critical condition while Dr Hodges performs hip surgery on a kitten and Dr Ferguson treats an abscess.

It's Christmas season in Michigan and Dr Pol and his team treat Tink and Lola, two dogs who are desperately in need of help.

The team is saddened to see that Archer, the miracle dog that survived a fire, is back in the clinic after a dog bite left a gaping wound.

Pugs in a Blanket: The Docs at Critter Fixer bet the farm on some risky bids at a local cow auction and check on a pregnant pug and afterward, her new pups.

Life on the River: Home to bears, moose, wolves and endless wilderness, this northern Alaska national park is one of the last untamed places on the planet.

Much Ado About Puffin: The zoo is bustling as a gator needs blood drawn, a lioness needs her tooth extracted and puffin parents nervously wait for their eggs to hatch. All ages.

It's fall in Michigan, and the Pols are ready for Halloween. The candy bowl is out, the leaves are turning, and the clients are in costumes. RATING: NU12.

Simon and Siouxsie find their lives on the line when they go out to a vicious snake that's eaten two kittens. An injured spitting cobra needs urgent treatment.

Waterworld: An enchanting look at the planet's rarely-seen creatures as they contend with the volatile waters of the world's largest river systems.

A look at nature's predators, as grizzly bears fight wolves and trout run deadly gauntlets of river otters and osprey.

Serene beaches provide the backdrop for epic predator battles as coastal creatures go head to head in a ferocious fight for survival.

Death Moan: Journey deep within the Arctic backcountry, as the changing seasons bring new risks to the next generation of Alaskans. U.

Time is short and the police pile on the pressure when Thord struggles to get a 16-wheeler back on the road. All ages.

From miniature murderers to nature's biggest brutes, witness wildlife at war in these deadly battles for turf, dominance and the right to mate.

Close Call: As ravenous sharks threaten to derail the team's mission, Cyril and his team race to find the Giant Trevally, stopping at nothing to succeed. U.

From limping labradors to damaged Danes, it's a dog's world as the team treat man's best friend. But after a busy day, an afterhours emergency arrives.

The Alaska Raptor Center rescues two severely-injured eagles, and they take in a raven covered in fish guts.

Rivers of Death: Huge crocs get ready to gorge as the great migration crosses the Mara. Anacondas mean danger by the river too, as they lie waiting to crush their victims alive.

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Dr Oakley races the clock to wrangle a herd of bison. She also treats a bald eagle with a blow to the head and a cat with a confusing case of curled claws. 12+.

It's spring and the Alaska SeaLife Center is teeming with orphaned seal pups. Puffins are about to hatch, and the team brings in an ancient shark.

The team head to the Deep South on the trail of a huge catfish said to be able to swallow a man whole. Does it exist? And if so, can they catch it.

It's Owl Good: While Dr Hodges flies to the rescue of an owl, the pressure is on for Dr Ferguson as he places an adrenal implant in a ferret.

From limping labradors to damaged Danes, it's a dog's world as the team treat man's best friend. But after a busy day, an afterhours emergency arrives.

As Dr Oakley assesses a reindeer herd, the team try to get past a donkey protecting a mini horse, before checking in on some therapy animals.

Waterworld: An enchanting look at the planet's rarely-seen creatures as they contend with the volatile waters of the world's largest river systems.

Head inside one of the country's newest national parks. It boasts more species than any other desert in North America, as well as incredible floral blooms.

Running Otter Time: The vets treat seven pythons as the orphaned otter pups go to fish school and the keepers rush to help some arctic foxes. All ages.

In the midst of all of their usual cases, the staff of Pol Veterinary Services pulls together to help a dog that was hit by a car. RATING: NU12.

It's Simon and Siouxsie to the rescue when a black mamba slithers into a TV, a spitting cobra chases a nun and a baby python gets trapped in the air con.

Big Bear Theory: After a series of mishaps, Sloth Bear Heidi Rose is ready to find a mate. Plus, the team helps a Three Banded Armadillo het his groove back.

The team undertake the high-pressure renovation of a tank belonging to two over-protective fish collectors. Can they meet their sky-high standards.

Warriors fight, kings fall and battle lines are drawn as chimpanzees and gorillas live out epic dramas in the heart of Africa's jungles.

The Break In: While temperatures rise and predators wake, Alaskans must stay on high alert in order to survive. U.

A drill rig hangs over a 15-metre cliff and Ole Henrik must make a life-threatening decision. All ages.

Nature gets nasty as the animal world goes to war. With survival and bloodlines hanging in the balance, the stakes are high for these ferocious fighters.

Barracuda Brawl: In the turbulent waters of the Bijagos Archipelago, Cyril's quest for a giant barracuda is quickly answered by a fish so powerful it knocks him off his feet. 7+.

Patients this week include a difficult, quarter-ton boar with razor-sharp tusks and the victim of a near-fatal skunk attack.

It's spring and the Alaska SeaLife Center is teeming with orphaned seal pups. Puffins are about to hatch, and the team brings in an ancient shark.

From polar bears and leopard seals to great whites and wolves, these snowbound predators can kill no matter what the conditions.

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Dr Oakley treats a lynx. She also pulls an all-nighter to give a dog an emergency caesarean. But getting the puppies out is just the beginning. 12+.

Witness as some brilliant rescue teams risk all to save seal pups, snowshoe hares, elks and eagles, all while battling extreme Alaskan weather.

The team brave the icy waters and hungry bears of Alaska in pursuit of a run of the world's biggest salmon.

Lizard Wizard: The team heads to NBA champ Dwight Howard's farm, a gecko turns inside out after taking a spill and a puppy overdoses on his owner's pain meds.

Patients this week include a difficult, quarter-ton boar with razor-sharp tusks and the victim of a near-fatal skunk attack.

Deep in the Costa Rican rainforest, Dr Oakley and the team track a tapir, help a pregnant sloth, release animals back into the wild and treat a Caracara.

Dive deep into the ocean and witness sea-dwelling creatures' most misguided attempts to find love.

Head inside California's jaw-dropping national park, a scenic home to coyotes, black bears, black-backed woodpeckers and great grey owls.

Puffin but Trouble: As keepers dream of a sand cat kitten, a nervous puffin chick learns to swim and rescued black bear cubs prepare for life outside the zoo. All ages.

A wide variety of animals make their way to Pol Vet every day, and in this episode, Dr Nicole and Dr Brenda face an influx of feline cases. RATING: NU12.

Simon and Siouxsie chase mambas across the city. Simon is forced to call in the fire brigade when he's faced with one of his most dangerous captures ever.

An astonishing look at the creatures that populate America's coasts, from Gentoo penguins and grizzly bears to giant squid. Narrated by Josh Brolin.

Head to South Africa's unforgiving west coast. There, creatures need the sea to survive, but the Atlantic's icy waters bring great risks.

A look at the unique ecosystem of Chile's Valdivian Forest. A biodiversity hot spot, it's home to a unique collection of ancient species. All ages.

Blood Trail: As the seasons change, the next generation of Alaskans search for autumn's bounty in order to prepare for winter. U.