Two women and two men face off in South Africa to see who can survive 21 days.

A photographer who lives and works out of his home is at risk of losing his business and his assistant because of his bloodthirsty cat; a fat feline's love for food is bound to be his greatest downfall.

A man's devilish cat, Darkness has made his girlfriend fear for her safety after moving in together; a couple's four felines have turned their brand-new home into a war zone.

One dozen goldendoodles take over a home and a pet pig's bed; a Westie chases after her wandering twin brother; Swiss mountain puppies find their stride.

Artistic Irish terriers meet their troublesome teen brother; eight corgis help out on the farm; an Akita puppy finds her place among her three tough brothers.

Outside Corpus Christi, Texas, Jeremy Sutcliffe is working in his garden when a rattlesnake bite puts him on the brink of death; while spearfishing in the Bahamas, Kent Bonde is blindsided by a bull shark that tears the calf muscle from his leg.

Jordan Carbery is investigating a noise outside his cabin and encounters a massive grizzly bear; Zanele Fox and her husband take a river tour when she is thrown from her raft and ravaged by a crocodile.

On a family trip to Pattaya, Thailand, Helen Costigan attends an elephant show when one of the massive beasts turns deadly; golf ball recovery specialist Scott Lahodik is diving in a Florida lake when he's attacked by a vicious alligator.

The Venom One team stages a rescue when deadly bees threaten an elderly living facility.

Burmese pythons and venomous cottonmouths are turning up in unexpected places.

Deadly snake in a mailbox; 12-foot python.

A snake farm is taken hostage, and it is feared the snakes may be unleashed into the suburbs.

Hurricane Isaac batters New Orleans, flooding Villalobos' evacuation location and isolating Tia from the rest of the world.

Tia recalls dramatic rescues and heartwarming moments from the fourth season of the series; updates on featured dogs.

Tia and M2 take to the water to prepare a pit bull for her forever home; a new parolee comes to Villalobos from Boston, hoping stay on track so that he can make his teenage son proud; a stray dog is near death when Lizzy and Heidi find him.

A Harley-loving adopter arrives; Mariah and Lizzy struggle to catch a stray pit in New Orleans East; when a litter of black pit-mix puppies are dropped off at the Sanctuary, Tia and M2 turn to social media to adopt them out.

Tia is called in to help rescue five injured dogs from a dog fighting situation; parolee Spencer gets out of jail and returns to Villalobos; Tia asks Spencer to help out with an adoption as a way to keep him on the straight and narrow.

Tragedy strikes after Tia and M2 agree to take two malnourished hounds from a rural shelter; Mariah and Lizzy give two dogs a positive outcome while working through the global pandemic; M2 reveals a crucial life chapter.

Tia's plans to handle the flooding at the Claiborne Warehouse change when a hurricane heads toward the city of New Orleans; M2 and Kenani rush to prepare for baby number two, and Tia and Tania's Texas rescue mission takes a sudden turn.

Tragedy strikes after Tia and M2 agree to take two malnourished hounds from a rural shelter; Mariah and Lizzy give two dogs a positive outcome while working through the global pandemic; M2 reveals a crucial life chapter.

Tia's plans to handle the flooding at the Claiborne Warehouse change when a hurricane heads toward the city of New Orleans; M2 and Kenani rush to prepare for baby number two, and Tia and Tania's Texas rescue mission takes a sudden turn.

Tia recalls dramatic rescues and heartwarming moments from the fourth season of the series; updates on featured dogs.

Tia and M2 take to the water to prepare a pit bull for her forever home; a new parolee comes to Villalobos from Boston, hoping stay on track so that he can make his teenage son proud; a stray dog is near death when Lizzy and Heidi find him.

Four Neo Mastiff puppies to be guard dogs; a shy Chihuahua puppy; a litter of English Setters compete.

A lumbering Newfoundland bowls over spotted Bengal kittens; Norwegian forest cats test the water at the beach; two kittens spread love at a rescue home.

A staff member heads to the Marine Mammal Center in California to help in rehabilitation efforts of elephant seals; African penguins Charlie and Lizzie have been together for 25 years, Charlie is having issues with his eyes; a piranha needs surgery.

The team welcomes two rescued southern sea otter pups Mara and Gibson, from the California coast; young ruddy ducks arrive at the aquarium and are introduced to their new habitat. Nandi, the aquarium's smallest manta ray, is due for a checkup.

Polka, a bottlenose dolphin, has a raspy voice and needs to see the doctor to get the all-clear; staff excitedly prepare for the upcoming puffin breeding season; two wobbegong sharks are due for a checkup; a curious box turtle goes for a walk.

In honor of his new hit single Rack City, hip hop artist Tyga wants a tank literally filled with cash that makes him feel like a million bucks.

World-famous DJ Steve Aoki wants a custom, three-headed dragon on the verge of escape inside his tank; the guys must make the job as outrageous as the DJ himself.

Building a DJ booth aquarium -- the first of its kind -- upon request from music superstar DJ Redfoo of the band LMFAO; Wayde and Brett face enormous pressure to complete the job on time.

Wayde and Brett take on The Bellagio Hotel and Casino, which performs a massive makeover to its conservatory five times a year.

Pete uses hand-hewn rustic cedar to build an African-inspired circular hut treehouse complete with aerial walkway, spiral staircase and thatched roof.

Pete builds a Scottish-inspired treetop cottage for Scottish gardeners in Tulsa, Okla., that connects to the clients' home by way of a sky bridge.

Pete builds a high-tech recording studio oasis up in the trees that perfectly blends into the heart of the outdoors. CeeLo Green soon arrives to lay down a brand-new track upon completion.

Pete builds a 600-square foot Western-style man-cave tree house that includes a cigar humidor, a meat smoker, and a flat-screen TV, for a father of three daughters in Texas.

A 500 square-foot ski lodge treehouse with a stainless steel candy kitchen and wine bar, 11 feet in the air and among 14 camphor trees is the gift Santa Pete wants to give the candy and wine making Splinter family of Northern California.

The NTS team focus their chi to create a meditation space 20 feet high through twisting maples for a couple in West Seattle.

Pete and his team undertake a sticky challenge and reinvent the classic single-tree treehouse; constructing a magnificent and whimsical beehive-like structure soaring 30-feet high in a majestic Douglas fir.

In Kentucky, Pete creates a treehouse with 17-foot-high ceilings and open-frame timber rafters, allowing a couple with a love of tree-climbing to harness up and dangle from both inside and out.

Pete takes on an exciting project for two tastemakers in Maine that includes a towering rooftop crow's nest and a wall of windows.

The NTS team focus their chi to create a meditation space 20 feet high through twisting maples for a couple in West Seattle.

Pete and his team undertake a sticky challenge and reinvent the classic single-tree treehouse; constructing a magnificent and whimsical beehive-like structure soaring 30-feet high in a majestic Douglas fir.

In Kentucky, Pete creates a treehouse with 17-foot-high ceilings and open-frame timber rafters, allowing a couple with a love of tree-climbing to harness up and dangle from both inside and out.

Pete takes on an exciting project for two tastemakers in Maine that includes a towering rooftop crow's nest and a wall of windows.

Pete builds a Scottish-inspired treetop cottage for Scottish gardeners in Tulsa, Okla., that connects to the clients' home by way of a sky bridge.

Pete builds a high-tech recording studio oasis up in the trees that perfectly blends into the heart of the outdoors. CeeLo Green soon arrives to lay down a brand-new track upon completion.

Lucas Congdon and his crew are tasked with creating a jungle feel in a suburban backyard.

Lucas creates an outdoor water room in which a mermaid could live; former clients that love the ocean want to remodel their tiny pool that sits yards away from the Gulf of Mexico.

Host Dan Cabela examines how the regulated hunting of ibex in the remote mountains of Türkiye has helped protect large areas for wildlife and fund local conservation initiatives.

A look at why a humpback whale would hold a diver hostage, how a colony of 1.5 million animals hide from the world in plain sight, and how a surprising stash of acorns could disrupt a whole town.

A look at what could make an animal vanish into thin air, what could cause the sea to take on an eerie glow, and what event would bring killer whales together in huge numbers.

A look at if fish really can predict earthquakes and why eggs are egg shaped.

A look at why a skunk would do a handstand, why 5,000 birds fell from the sky in Arkansas, and what would make a frog flash like a lighthouse.

A look at the possibility that zombie spiders are real and why would a pod of beluga whales adopt a unicorn of the sea.

A giraffe named Mashengo journeys from the Indiana Zoo to his new home in the Bronx; keepers hand-raise endangered ducklings and release them at the Central Park Children's Zoo; love is in the air for a pair of cloud rats.

Crate training Nikita the Amur tiger in preparation for her move to Washington, D.C., proves challenging; an endangered Chinese alligator shows signs of being pregnant; staff prepare to release rare New England cottontail rabbits into the wild.

Cardiologists try to determine why the geladas are experiencing a life-threatening heart condition; Nile crocodiles are shifted off exhibit for a maintenance project; the elephant shrews are breeding.

A new bison calf has a hard time keeping up with his mom; the bird department prepares a group of Von der Decken hornbill chicks for their move to the Minnesota Zoo; keepers at the Central Park Zoo hope the female snow monkeys accept a new male.

Dr. Jeff and his team must act fast to save the life of a young dog frothing at the mouth; Dr. Lindsay treats a sick goldendoodle; the team treks to the mountains to assist huskies; Penelope the Pig causes Dr. Jeff to try a new surgery.

Dr. Jeff comes to the aid of a puppy with legs shattered by a hit-and-run driver; newly-hired exotic pet vet Dr. Jeff Baier helps an underweight Burmese python.

Dr. Jeff fights to save a bearded dragon suffering from massive seizures; Dr. Nichols must learn why a dog has lost its appetite and has difficulty breathing; a routine cat neuter gets intense quickly.

Dr. Jeff treats a puppy with a broken leg saved from a kill shelter in Oklahoma; a dog fights for its life after eating an entire box of marijuana-infused chocolates; two abandoned kittens are dropped off; the newest vet helps a rat.

Dr. Jeff and his team drive down to Mexico to help as many pets as possible out of a mobile clinic.

Dr. Jeff pulls out all the stops to help two Chihuahuas found abandoned in a storm drain; a cat's bizarre eating habits threaten its life.

A kitten that has suffered head trauma needs immediate attention; Dr. Amy performs a risky surgery on a dog with a very weak heart; family's pit bull is hit by car; two wallabies exhaust Dr. Baier.

Dr. Dee has to be careful when she visits a ranch to check on a pack horse named Red; Dr. Terry and Nicole head to a remote clinic; dog has a mass that appears to be cancerous.

Dr. Dee puts her mother on a plane to a remote vet clinic in Manley Hot Springs; Rottweiler could have bone cancer; bunny suffers with large abscess; St. Bernard puppies stop by for a visit.

Dr. Jeff pulls out all the stops to help two Chihuahuas found abandoned in a storm drain; a cat's bizarre eating habits threaten its life.

A kitten that has suffered head trauma needs immediate attention; Dr. Amy performs a risky surgery on a dog with a very weak heart; family's pit bull is hit by car; two wallabies exhaust Dr. Baier.

Dr. Dee has to be careful when she visits a ranch to check on a pack horse named Red; Dr. Terry and Nicole head to a remote clinic; dog has a mass that appears to be cancerous.

Dr. Dee puts her mother on a plane to a remote vet clinic in Manley Hot Springs; Rottweiler could have bone cancer; bunny suffers with large abscess; St. Bernard puppies stop by for a visit.

Dr. Jeff comes to the aid of a puppy with legs shattered by a hit-and-run driver; newly-hired exotic pet vet Dr. Jeff Baier helps an underweight Burmese python.

Dr. Jeff fights to save a bearded dragon suffering from massive seizures; Dr. Nichols must learn why a dog has lost its appetite and has difficulty breathing; a routine cat neuter gets intense quickly.

Lucas builds a family size water park in a neglected backyard that includes a waterslide and double-decker outdoor patio.

The boys look back at their fondest and most dangerous mishaps in Mississippi including the time they helped the Gulf Coast Gator Ranch capture over 200 gators or the first gator they caught named Petsy or the time...

When a child is thrown from a boat and badly injured, wildlife agents are first on the scene; a night hunter faces multiple felony charges when agents make a grave discovery, agents confront a jet ski rider who risks drowning and gets belligerent.

A suspicious driver leads wildlife agents on a high-speed chase through a national forest; goose-hunting guides are caught in a repeat offense; a routine stop turns treacherous when a suspect is discovered concealing a firearm.

A suspicious man fleeing on the levee after dark puts wildlife agents in danger; a first-time bowhunter could lose his kill over a major violation; agents question a duck hunter with an attitude who seems to be hiding something.

A bizarre discovery inside an abandoned cooler escalates a littering probe; wildlife agents patrolling in dense fog are thrown into a dangerous encounter, and a burglary investigation uncovers an illegally taken deer.

Suspicious shotgun blasts on Catahoula Lake lead wildlife agents on a high-speed chase; a trail of beer cans points to a pair of hunters with multiple violations; on the bayou, agents catch a lawbreaking crawfisherman.

When a pair of illegal hunters flee by truck, wildlife agents set out to track them down; heaps of trash dumped at a fishing spot lead to a suspect who denies any wrongdoing; damning evidence in a truck bed catches a hunter in a lie.

LDWF biologists on a conservation mission get hands-on with black bear cubs, facing a protective mama bear; hunters get caught using a banned method to hunt ducks; wildlife agents stake out after dark for a felon with an illegal gun.

An intoxicated woman surprises a warden when she reveals she's pregnant, then friends have to come pick her up and drive her car home.

Wardens monitor hunters who try to start the big game hunting season early; a landowner chooses to press charges against a trespassing hunter; the warden catches a hunter lying, with ballistics evidence to back it up.

Wardens track down out-of-state hunters not abiding by the law, and the illegally harvested elk may end up getting confiscated; Wardens get the word out to snowmobilers about required permits.

Warden Chris Crane responds to the call to rescue a kayaker; anglers are caught fishing in a prohibited area; suspicions arise when wardens investigate the cause behind multiple mysterious deer deaths in Missoula Valley.

Wardens go on hot pursuit to catch a hunter who dodged a routine check; drought conditions in Montana shut down hunting and fishing for the season; a pack of pesky bears make their way into town.

A warden is skeptical when a bow hunter without a license claims he's only elk calling. Hunters find out the hard way because they're on private property, and when an endangered grizzly bear is shot, wardens come out in full force.

Stories aren't adding up when wardens go to check if a group has valid fishing licenses; Wardens confront anglers fishing in closed water and crack down on anglers during the limited paddlefish season.

A warden is skeptical when a bow hunter without a license claims he's only elk calling. Hunters find out the hard way because they're on private property, and when an endangered grizzly bear is shot, wardens come out in full force.

Stories aren't adding up when wardens go to check if a group has valid fishing licenses; Wardens confront anglers fishing in closed water and crack down on anglers during the limited paddlefish season.

Wardens monitor hunters who try to start the big game hunting season early; a landowner chooses to press charges against a trespassing hunter; the warden catches a hunter lying, with ballistics evidence to back it up.

Wardens track down out-of-state hunters not abiding by the law, and the illegally harvested elk may end up getting confiscated; Wardens get the word out to snowmobilers about required permits.

Standard poodle Percy keeps his sister from exploring; a basset hound makes an unlikely friendship; a bull terrier mother contends with her pups' boundless energy.

Litter of six Maine Coon kitties has 5 girls and 1 boy; quiet kitten with a limp within litter of Siamese cats; shy black kitten befriends old tabby.

Tia heads to South Carolina to save an aggressive dog that is in danger of being put down; A couple from Florida comes to Villalobos, hoping to find a dog that will enjoy retired life with them; Parolee Toney Converse takes on more responsibility.

Tania tries to rescue a puppy that's hiding beneath a shed; a potential adopter visits Villalobos to find a friend for her dog, and she's only interested in the hounds; a beloved employee learns he's finally off parole.

Tia takes in a pit bull that was rescued from terrible conditions in Kuwait; an adopter travels from Michigan in hopes of finding a new best friend; when a stray dog ends up at Villalobos, Earl is determined to track down its owner.

A Pennsylvania prison offers to take 20 dogs from Villalobos; an emaciated pit bull fights for its life; a potential adopter travels from Michigan to meet a dog that stole her heart.

Mariah and Spencer rescue a dog with severe injuries; a parolee gets arrested; a couple hope to find a friend for their bulldog.

Robert takes on the challenging task of relocating Bosco, the most aggressive croc at the zoo; Bindi must investigate Forest the giraffe's bad knee problem; Terri helps Harley the koala find love at the end of a difficult breeding season.

Terri returns to her hometown in Oregon to help Brady, a cougar in need of a vital health check; at the zoo, Robert is on a mission to rescue Oscar, a small bird with a big attitude; Bindi bathes an echidna with bad skin allergies.

Robert gets in the water with Gloria, a 12-foot reticulated python, to swim alongside her for the first time in the Crocoseum; Bindi welcomes home two orphaned kangaroo joeys; Terri helps release a rescued wedge-tailed eagle back into the wild.

While pregnant, Bindi continues to work at the Wildlife Hospital.

The Irwins take action when a croc becomes ill.

Terri helps prepare the zoo's new baby rhino, Carrie, to receive a lifesaving vaccine; Robert is on a rescue mission to save two black swans in very bad shape; Bindi tries to determine if a cranky wombat named Poa might be pregnant.

After weeks of being closed due to the global pandemic, the Irwins race to prepare for the reopening of the zoo; Robert helps deliver a litter of newborn tiger cubs, while Bindi handles a sudden crisis at the wildlife hospital.

Era Alaska has a canine delivery for four-time Iditarod champion Lance Mackey; Jim and Ferno must cope with the airline's busiest day of the year.

Vicious crosswinds wreak havoc on small planes; a power blackout test Ariel's abilities.

Luke tries to complete a rescue before the sun sets for two months; a bootlegger tries to smuggle in illegal liquor.

Jim and Brooks look for potential landing strips; an Eskimo feast is prepared for returning pilot John Ponts.

Era Alaska has a canine delivery for four-time Iditarod champion Lance Mackey; Jim and Ferno must cope with the airline's busiest day of the year.

Vicious crosswinds wreak havoc on small planes; a power blackout test Ariel's abilities.

Luke tries to complete a rescue before the sun sets for two months; a bootlegger tries to smuggle in illegal liquor.

Jim and Brooks look for potential landing strips; an Eskimo feast is prepared for returning pilot John Ponts.

While pregnant, Bindi continues to work at the Wildlife Hospital.

The Irwins take action when a croc becomes ill.

Papillon puppies help their sister Kitty overcome shyness; St. Bernard puppy trio seeks adventure; Airedale terrier named Merlin tries to disappear from litter.

Black and white kitty named Moo faces a baby skunk; orange tabby kitten Gus tries to befriend dog; kitty Savannah looks for a brave playmate.

The search is on for a missing boater who may have suffered a stroke on Corney Lake; wildlife agents deploy as a hurricane makes landfall, rescuing stranded survivors from the floodwaters and dispensing lifesaving supplies.

Deep in the woods and bayous of Louisiana, wildlife agents protect the state's resources; a crab fisherman is caught stealing dozens of traps, a hunter crosses state lines with an illegal deer and agents rescue an injured bald eagle.

In southern Louisiana, Lt. David Nunez and Sgt. Austin Arteaga investigate a group of bird hunters on opening day of teal season; a repeated offender is busted for taking immature crabs; a late-night deer decoy leads to a hunter in handcuffs.

As a storm rolls in over St. Tammany Parish, Cpl. Blaine Wagner and Cpl. Rick Clark assist in a search-and-rescue mission for a missing fisherman; agents confront a repeat offender for harassing hunters, and a felon is caught with an illegal firearm.

In Jackson Parish, a reckless hunter is investigated for shooting down a highway; agents stake out a man suspected of two illegal deer kills; duck hunters are confronted for harassment; a crowded boat parade ends with citations.

In Ouachita Parish, a trespassing investigation leads to a dicey encounter and multiple seizures of deer; agents confront a group of duck hunters who are spotted killing non-game birds; health code violations are found during a routine oyster patrol.

As Hurricane Ida makes landfall, wildlife agents deploy to help the people of Louisiana; an injured woman is trapped in a flooded hotel; elderly neighbors await rescue in punishing conditions; lifesaving supplies must be delivered to those in need.

While using the LDWF's spy in the sky drone, agents track down a boat captain breaking the law in Plaquemines Parish; a family of shrimpers is investigated for pulling oversized nets; two feuding fishermen are suspected of being under the influence.

Warden Cain and his staff make the difficult decision to evacuate Angola when the Mississippi River's rising waters threaten to flood the penitentiary.

Young convict Redneck prepares for his first rodeo ride, while an unruly inmate may not get his shot at glory; a suicide is reported in the dangerous punishment unit known as Camp J.

An inmate prepares for a reunion with the son he hasn't seen in a decade; teams are put on alert when narcotics infiltrate the penitentiary.

Lt. Col. Slater is assigned to run a public horse auction; Warden Cain tries to keep order when inmates stage a hunger strike.

A new inmate to Angola finally meets his grandfather, a prisoner also serving a life sentence; Lt. Col. Slater reconnects with a dying inmate.

Warden Cain unleashes the hounds when a prisoner attempts a nighttime escape; inmate Jesse wants to handle more responsibility; inmate Oliver asks permission for a wedding ceremony in Angola.

Lt. Col. Slater balances his prison duties with his responsibilities as a single father; former rodeo champ Cracker risks serious injury for another shot at glory; a local newspaper launches a smear campaign against Warden Cain.

The convicts prepare for the final rodeo of the season; inmate James learns that he has been granted early release from Angola.

A new inmate to Angola finally meets his grandfather, a prisoner also serving a life sentence; Lt. Col. Slater reconnects with a dying inmate.

Warden Cain unleashes the hounds when a prisoner attempts a nighttime escape; inmate Jesse wants to handle more responsibility; inmate Oliver asks permission for a wedding ceremony in Angola.

Lt. Col. Slater balances his prison duties with his responsibilities as a single father; former rodeo champ Cracker risks serious injury for another shot at glory; a local newspaper launches a smear campaign against Warden Cain.

The convicts prepare for the final rodeo of the season; inmate James learns that he has been granted early release from Angola.

Warden Cain and his staff make the difficult decision to evacuate Angola when the Mississippi River's rising waters threaten to flood the penitentiary.

Young convict Redneck prepares for his first rodeo ride, while an unruly inmate may not get his shot at glory; a suicide is reported in the dangerous punishment unit known as Camp J.

Four little Tibetan Spaniels born into a family of watchdogs; Newfoundland puppies train to be rescue dogs; patchwork puppy blends into Retriever mix family.

A great Pyrenees, Snow, wants to be a movie star; border collie pups wish to be champion herders; a Scottish terrier tries to befriend a cat.

Dr. Ross and vet tech Kyerra race to save a stray cat horrifically mangled by a car engine; the Rosses move into their new home while Dr. Blue treats a 700-pound arthritic pig; Dr. Lavigne hears a rescue Chihuahua's incredible story.

Dr. Blue discovers a huge problem for a paralyzed Yorkie; Dr. Ross takes care of a pair of post-scuffle roosters, before joining Dr. Lavigne on a hyena consultation; the Lavigne family hosts a dinner party showcasing Anne's cooking skills.

Dr. Blue flies into action when a Rottweiler in labor gets rushed into the hospital with two puppies stuck inside her; the three vets grab the reins and their cowboy hats to ride horseback into town for Houston's biggest rodeo parade.

The doctors visit their alma mater for a class reunion and become professors for a day; a shih tzu is rushed to the clinic after swallowing a large piece of rawhide, while the owner of a pit bull with a deformed leg must consider drastic surgery.

Jackson must rescue two cats from their cycle of co-dependency before they're kicked out of their owner's house; Jackson is introduced to a couple who shelters four special need felines and a man who struggles with his frisky feline.

Jackson rehabilitates a cat who is tortured by fear and is aggressive toward her tail; Jackson is introduced to a pair of owners whose cat is constantly knocking things over, climbs up window screens and spontaneously attacks.

An expecting couple is hesitant to have their cat Sebastian around because of his unpredictable and violent streak; Jackson is tasked with helping a man tame his wild cat and revisits a heroic cat's small town in Ohio.

A man is tired of living in fear of his girlfriend's cat and vows if things don't change he will move out permanently. Meanwhile, a couple is convinced their feline Woody is the root cause behind their deceased cat's death.

A woman creates a video as a desperate plea for help to find her ferocious feline a new home; a couple has three cats who viciously attack one another while treating the home as their personal litter box.

Ambreen has been in an abusive relationship for the past 13 years, but her abuser is her cat, Calvin; Josh has two women in his life--his cat Nico and his girlfriend, who recently moved in with them. But Nico has been anything but welcoming.

A football coach and midwife attempt to survive in Chiapas, Mexico, a location no survivalist has lasted 21 days in; their different approaches to survival hurt their ability to endure.

A transgender Air Force vet and a South African farmer tackle the deadly bush of Zambia, where territorial elephants, baboons and crocodiles threaten their every move; when disaster strikes, a sibling seeks redemption.

Jaclin, a paralegal, and Michael, a fishing boat captain, take on 21 days in the mighty Kalahari Desert; they soon are hit with an unexpected cold front and aggressive lions and rhinos threatening their shelter.

Survivalists Max and Rylie are dropped in the South African bush with two novice fans to try and survive 21 days with spitting cobras, aggressive warthogs, rhinos and leopards.

Jaclin, a paralegal, and Michael, a fishing boat captain, take on 21 days in the mighty Kalahari Desert; they soon are hit with an unexpected cold front and aggressive lions and rhinos threatening their shelter.

Survivalists Max and Rylie are dropped in the South African bush with two novice fans to try and survive 21 days with spitting cobras, aggressive warthogs, rhinos and leopards.

A woman creates a video as a desperate plea for help to find her ferocious feline a new home; a couple has three cats who viciously attack one another while treating the home as their personal litter box.

Ambreen has been in an abusive relationship for the past 13 years, but her abuser is her cat, Calvin; Josh has two women in his life--his cat Nico and his girlfriend, who recently moved in with them. But Nico has been anything but welcoming.

Bernese mountain dog pups befriend neighbors; Shiba Inus challenge a neat-freak mom; a young mixed-breed pup takes after his dad.

A dog spa hostess has her work cut out for her by 10 whippet pups; a mix-breed pup looks to fit in with sisters; mother's serene life is disrupted by a litter of 13 black Russian terriers.

Bob Legasa is hunting in Montana and what he thinks is a bluff charge from a grizzly bear is, in fact, a near-lethal attack; while canoeing in Zimbabwe, Kristen Yaldor is thrown into the water and finds herself in the jaws of a hippopotamus.

During an archery hunt in Cranbrook, British Columbia, Chad Dueck comes face-to-face with a mother grizzly bear; in Tracy, Calif., Walt Dean King is savagely attacked by a Brahma Bull roaming his neighborhood.

While vacationing in South Africa, Peter Knottenbelt suddenly finds himself in the jaws of a massive crocodile; in Nova Scotia, Meg Doyle is walking her beloved dog when they're suddenly ambushed by a pair of angry raccoons.

Forrest ventures home to Zimbabwe in search of the mysterious Cape lion; he and the crew navigate the African bush determined to get DNA proof, facing threats of charging rhinos and huge prides of lions.

In Vietnam, Forrest teams up with a conservation group to save the largest turtle species in the world from extinction; using cutting edge technology, they attempt to find a suitor for the last and only surviving Giant Softshell.

Deep in the jungles of Colombia, Forrest is on a mission to prove the Rio Apaporis Caiman still exists; locals believe this crocodilian resides within a lawless land inhabited by guerrilla rebels, kidnappers and deadly predators.

Forrest is determined to find out if the famously reclusive Ivory Billed Woodpecker still exists; the alligator and poisonous snake infested swamps of Louisiana make for a challenging mission, but he is prepared for anything.

Jeremy Wade heads to the Mekong River in Thailand in search of the giant freshwater stingray.

Jeremy searches for a monstrous beast that reportedly lives in the Zambezi River and can swallow children whole.

Jeremy stalks a rare river beast in Mongolia while minding the armed outlaws in the wilderness.

Jeremy dives into Western Australia's crocodile-infested Fitzroy River to catch an elusive, endangered shark.

Jeremy investigates when a terrifying creature with sharklike teeth is rumored to exist in Botswana's Okavango Delta.

Jeremy investigates grisly river attacks in the Himalayas, but is warned that the suspected predator is a sacred creature.

Jeremy swims into the lair of the snakehead, a predatory freshwater fish with a killer reputation.

Jeremy Wade journeys up the Congo River in search of the Goliath tiger fish.

Jeremy fishes in the Alaskan wilderness and searches for a lake monster of native legend.

Jeremy investigates grisly river attacks in the Himalayas, but is warned that the suspected predator is a sacred creature.

Jeremy swims into the lair of the snakehead, a predatory freshwater fish with a killer reputation.

Jeremy Wade journeys up the Congo River in search of the Goliath tiger fish.

Jeremy fishes in the Alaskan wilderness and searches for a lake monster of native legend.

Jeremy searches for a monstrous beast that reportedly lives in the Zambezi River and can swallow children whole.

Jeremy stalks a rare river beast in Mongolia while minding the armed outlaws in the wilderness.

A puppy in search for companionship befriends a ferret looking for the same.

Share some very special moments as three litters of puppies and kittens celebrate their very first Christmas.

The staff becomes concerned when beloved African penguin Zola falls mysteriously ill; the aquarium witnesses the annual spawning of an endangered coral species; Maggie the false map turtle has a date with the dentist.

The staff becomes concerned when Jupiter, the rescued sea lion, is not himself; the Ocean Voyager exhibit awaits its new residents, black-blotched fantail stingray siblings Bacon and Tomato; Shelley the shy box turtle makes friends.

After eating all his tankmate's food, Tank the hungry sea turtle finds a space to eat in peace; two beluga whales are welcomed to their new home at the aquarium; Scarlett the lovable sea lion turns 2.

Star of "The Real Housewives of Beverly Hills" Erika Girardi AKA Erika Jayne wants a tank... and an octopus for that tank.

Brittany Kerr, wife of country superstar Jason Aldean, wants Wayde and Brett to surprise her husband with a fish tank; the great outdoors-themed tank has to be a total secret and built before Jason returns from his tour.

Hip-hop superstar Akon has purchased a new dream house; Wayde and Brett must build two centerpiece tanks before Akon can move in.

Wayde and Brett get into the patriotic spirit when Olympic basketball phenom Paul George gives them a call. He wants two identical fish tanks next to his indoor pond, and he wants it done by the time he gets home from the Olympics in Rio.

Pete Nelson uproots an existing treehouse from the family-owned bed & breakfast Treehouse Point to build a custom-made treehouse as a housewarming gift for his daughter, Emily.

Pete finds inspiration in old tales to build a mesmerizing treehouse, with a curved turret that soars two stories high and a deck to take in the amazing sights, over the stems of a twisty silver maple on the shore of Lake Chelan.

Pete and his crew are tasked with building a nature center, 14 feet off the ground at 10,000-acre nature preserve, Dogwood Canyon in Lampe, Missouri, established by Bass Pro Shops founder Johnny Morris, for the company's upcoming Christmas party.

Inspired by South American treehouse maestro Richard Brunnelli, Pete builds a hexagonal live-in treehouse for a Treehouse Workshop graduate in coastal Oregon.

Pete builds a clubhouse for a camp for children battling cancer; a crow's nest outpost and peek-a-boo roof for full interaction with nature.

A magical castle treehouse to inspire artistic endeavors; partying is the task for Pete and his crew in eastern Nebraska.

Pete and the crew round up the magnificent seven of cypresses alongside the Frio River and moseys on down to Leakey, Texas to build a gigantic, Texas-sized treehouse with the longest bridge in NT&S history.

Pete has a nine-day window to build a Zen-like sanctuary for some old friends in the shadow of the Blue Ridge Mountains in Canton, N.C.

Pete builds ski lodge-style treehouse complete with an indoor-outdoor fireplace and a rooftop snowmaker for a ski-loving family.

A magical castle treehouse to inspire artistic endeavors; partying is the task for Pete and his crew in eastern Nebraska.

Pete and the crew round up the magnificent seven of cypresses alongside the Frio River and moseys on down to Leakey, Texas to build a gigantic, Texas-sized treehouse with the longest bridge in NT&S history.

Pete has a nine-day window to build a Zen-like sanctuary for some old friends in the shadow of the Blue Ridge Mountains in Canton, N.C.

Pete builds ski lodge-style treehouse complete with an indoor-outdoor fireplace and a rooftop snowmaker for a ski-loving family.

Pete finds inspiration in old tales to build a mesmerizing treehouse, with a curved turret that soars two stories high and a deck to take in the amazing sights, over the stems of a twisty silver maple on the shore of Lake Chelan.

Pete and his crew are tasked with building a nature center, 14 feet off the ground at 10,000-acre nature preserve, Dogwood Canyon in Lampe, Missouri, established by Bass Pro Shops founder Johnny Morris, for the company's upcoming Christmas party.

As the calls keep coming in, everyone has been stretched thin since Jimmy quit; Paul comes to the begrudging realization that it's time to replace him.

The Gator Boys are convinced now more than ever, after some sub-par volunteers and dangerous gators, that they really need to get Jimmy back; Ashley twists her ankle while trying to help Paul, turning a gator capture into a deadly situation.

Dan Cabela travels to Spain and France to learn more about chamois, a goat-antelope species steeped in history. Local development, conservation, and brown bear research are funded by regulated hunting, which has helped revitalize the chamois population.

A look at how spiders covered a town in webs overnight and why a lake in South America is the lightning capital of the world.

A look at how a bird could sing without using its voice and how an octopus could simply disappear from his aquarium tank.

A look at what animals are breaking into thousands of cars every year, how ants form a ten-foot bridge using only their bodies, and why did the fish cross the road.

A look at why a leopard let its dinner escape; an ominous dark mass looming over an Icelandic lake; some scorpions glow in the dark.

A look at how a moose get stuck in an apple tree; why a crow is snowboarding on a jam jar lid; and whether Yellowstone's super volcano is about to erupt.

Following surgery, Olga the ostrich is prepared to be reunited with her flock; a squirrel monkey arrives at the zoo; everyone's favorite warthog is back.

A new male okapi named Magani is paired with breeding veteran Kweli who has already had several calves, but Kweli develops congestive heart failure.

A team tests the problem-solving skills of lions against those of snow leopards; Willow, a young red panda, is having mysterious foot problems; the bird department awaits the gender reveal of two new adjutant stork chicks.

Iray, a red ruffed lemur, is rushed to the health center when keepers discover a wound on its leg; a new exhibit is built for the Pallas' cats, the original grumpy cats; seven baby turtles join the zoo's colony of an endangered species.

Dr. Jeff and his team lend a hand at National Mill Dog Rescue and are eager to find Ginger the Pomeranian a forever home; a dog that loves to swallow household objects must undergo emergency surgery; Jimmy the gecko gives Dr. Baier a surprise.

Khaleesi, the golden retriever pup undergoes a life-saving procedure; vet tech Blaire faces heartbreak over her beloved senior dog, Zula; during the global pandemic, Dr. Jeff and Hector ensure pets from an elderly community receive proper care.

Dr. Jeff makes a shocking discovery when a rescued street pup named Kova comes in with a severely injured leg; little Fonda needs to find a forever home after being thrown from a car; Dr. Jeff builds his beloved dog, Fred, his very own swimming pool.

Dr. Baier suspects a ferret suffers from a spinal injury after being attacked by the family canine; Dr. Jeff travels to a wolf sanctuary to spay and neuter a desperate pack of wolf-hybrids; three dogs are rescued from an overcrowded shelter.

Dr. Jeff tries his best to suppress news that he has a serious medical issue as he performs complex surgery on an internally bleeding puppy; the team races to fix a young dog's badly broken leg after a car hits it.