Angler Jeremy Wade pushes himself and his gear past breaking point to discover what killed a bride in the Colombian Amazon; amidst dense jungle and hostage-taking rebels, Jeremy discovers evidence that turns the investigation on its head.

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 investigates the case of a Bolivian man who had his face ripped off by a ferocious river predator, leading to a showdown with an old adversary.

Angler Jeremy Wade pushes himself and his gear past breaking point to discover what killed a bride in the Colombian Amazon; amidst dense jungle and hostage-taking rebels, Jeremy discovers evidence that turns the investigation on its head.

Jeremy travels to South Africa to catch a bull shark lurking in freshwater locales.

Jeremy explores the legends and mystery surrounding the Congo River in Central Africa.

The most popular comic strip kitty; the various materials from which kitty litter is made.

The birthplace of the domestic shorthair cat; the breeds that compete at CFA cat shows.

The Georgia Aquarium sends a team to Cape Town, South Africa, to help rehabilitate and release a group of African penguins into the wild; a dive team installs a shipwreck feature into an exhibit to provide enrichment for their sea turtle.

Two African penguins, Freya and Neo, welcome a young chick, but there's cause for concern when health problems arise; staff work to train a trio of harbor seals to ride the elevator, with the only hiccup being a nervous seal named Floyd.

Beloved Asian small-clawed otter Pinkie has a recurring bloody nose, the team goes to great lengths to find out what could be causing it; feisty baby American alligators arrive at the aquarium and must learn to eat in an orderly way.

Wayde and Brett design a multipurpose tank for a fitness mogul; an Alabama casino requests a tank with a scaled replica of a historical lighthouse.

Wayde and Brett create two aquariums for a mall's new food court, then work to transform a vintage popcorn machine into a tank.

Wayde and Brett create a temporary tank for basketball star Dwyane Wade; a North Carolina restaurant requests a burger- and sushi-filled aquarium.

Redneck designs a RV aquarium; the team builds a large indoor tank that holds both alligators and sharks.

Pete helps three siblings surprise their parents with a Scandinavian-style, two stories, art studio treehouse with Murphy-bed art tables, multi-use studio area and sky tents in Wisconsin.

Pete builds a secluded, three-story, speakeasy-themed treehouse, 60 feet above the ground with rooftop lounge and writing-and-recording room with vintage guitars for country music superstar Brian Kelley, of the award-winning duo Florida Georgia Line.

Pete and the crew look to Buddha's teachings as they build a traditional Japanese teahouse 20 feet in the air complete with a shoji screen wall, tatami mats, low table with sunken floor and pagoda style roof for a zen-like paradise in Seattle.

Pete is tasked with building a tree-top, Native American themed, summer camp treehouse with a built-in kennel, French door, climbing wall, back deck and fire pole for a young family on the Washington coast.

Pete builds a two-story, bird nest-inspired "human nest" with woven driftwood railings on a wild-bird paradise in Arkansas.

Pete returns to where he built his very first treehouse; now with experience, knowledge, new techniques and some steel, he can rebuild it; he has the technology; he has the capability to build the world's first bionic treehouse.

Pete teams up with Make-A-Wish and the local fire department of Flagstaff, Arizona to grant an 8-year-old's wish of a whimsical treehouse masterpiece inspired by "The Boxtrolls" movie.

Together with an inventive treehouse designer, Pete and Daryl create a 30-sided, sky-high geometric globe connected to the trees solely by wires for a thrill-seeking family in Seattle; a look back upon their many creations.

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

Pete returns to where he built his very first treehouse; now with experience, knowledge, new techniques and some steel, he can rebuild it; he has the technology; he has the capability to build the world's first bionic treehouse.

Pete teams up with Make-A-Wish and the local fire department of Flagstaff, Arizona to grant an 8-year-old's wish of a whimsical treehouse masterpiece inspired by "The Boxtrolls" movie.

Together with an inventive treehouse designer, Pete and Daryl create a 30-sided, sky-high geometric globe connected to the trees solely by wires for a thrill-seeking family in Seattle; a look back upon their many creations.

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

Pete builds a secluded, three-story, speakeasy-themed treehouse, 60 feet above the ground with rooftop lounge and writing-and-recording room with vintage guitars for country music superstar Brian Kelley, of the award-winning duo Florida Georgia Line.

Pete and the crew look to Buddha's teachings as they build a traditional Japanese teahouse 20 feet in the air complete with a shoji screen wall, tatami mats, low table with sunken floor and pagoda style roof for a zen-like paradise in Seattle.

The Lucas Lagoons team are in Siesta Key to turn an old pool into a natural lagoon that connects to a new koi pond; they also install a new aquaponics system.

A family in the Florida wetlands wants the Lucas Lagoons crew to build a unique Rocky Mountain-style lagoon; Lucas quickly learns his clients will be over his shoulder, supervising him along the way.

In 2001, a mysterious half-human, half-animal hybrid bounds across rooftops of New Delhi, running down residents and brutally attacking them; Mungo's investigation attempts to uncover the truth of the Monkey-Man.

A merciless predator known as the Genali that prowls the waterways of Borneo, hunting and killing children, could actually be a reticulated python, a crocodile, or even a deadly dragon.

The birth of a little blue penguin causes a sensation at the Bronx Zoo; the veterinary team scrambles to figure out what is wrong with Snowball, a snow leopard; the exhibits team designs an exhibit for the newly arrived blue iguana.

The Zoo's huge male sea lion is in rut, and staff need to move the younger males before he becomes territorial; the veterinary team come up with a solution to repair Dinky the Flamingo's broken ankle; feeding a rock python proves challenging.

Leo, a snow leopard rescued from Pakistan, has trouble eating because of a broken canine; the bird department works feverishly to restore a beehive for the bee-eater birds; Ambassador Center staff work with an adorable Fennec fox named Charlie.

A tomistoma, a freshwater crocodilian, stops laying eggs and a team of keepers scrambles to treat her; the veterinary team has to rescue a baby antelope that isn't getting the care it needs from its mother; Mert the Goose takes a field trip.

Two adorable tiger cubs need to move to the adult exhibit; a silverback gorilla receives pioneering treatment to curb his worsening eyesight; a passionate keeper plays matchmaker to a peculiar pair of birds.

A Bernese Mountain Dog suspected of scarfing an unmentionable feast is a potential record-breaking challenge for Dr. G; a feline rushed to a clinic after a close encounter with a sewing kit sparks a race against the clock to save a family from loss.

An old dog develops new tastes that aren't exactly what they seem; when a feline devours a stringy oddity, vet staff are blind to its identity; Ben realizes Dr. G is nearing a major career milestone.

A tuxedo cat takes playtime too far, pitting Dr. G against a life-threatening foreign body; a barbecue season corn-conundrum lands a Golden Retriever in urgent care.

A canine's strange appetite delivers a stomach full of surprises; a cat with hair-ific taste leads to a marathon recovery mission; Dr. G's son, Ben, joins him for an action-packed summer.

When a Golden Retriever's tastes go off the beaten track, Dr. G's skills must be rock-solid; Captain the three-legged cat's appetite proves to be as unique as his form; Dr. G's furry family brings a special inspiration to his work and life.

Rocky, a mixed-breed canine suspected of scarfing a purse, deals Dr. G unexpected side dishes; a puppy with a troubled tummy is a head-scratching case from beginning to end.

A black Lab swallows toxic metal; a lost cat found with a mysterious injury; a tiny dog struggles to deliver a large puppy.

A cat with a shattered paw needs help; a rescued opossum needs a new enclosure; in South Dakota, a badly injured dog steals Jeff's heart.

With a puppy's leg on the line, Dr. Jeff attempts a new surgical procedure; a ferret bites off more than it can chew; a disturbing discovery while treating a cat; treating rescued bears.

The team heads to Mexico to help desperate owners and their pets; a teenage boy and his sister worry about their sick dog; a remote village has never seen a vet.

Dr. Dee sets off on her first adventure as a new pilot to treat animals in the Arctic Circle; aging Border Collie; disabled Siberian husky.

A large horse may have a deadly problem within; spunky miniature horse is treated; Dr. Dee teaches castration to a new pig farmer; Dr. Terry returns to Fairbanks with a surrendered dog.

With a puppy's leg on the line, Dr. Jeff attempts a new surgical procedure; a ferret bites off more than it can chew; a disturbing discovery while treating a cat; treating rescued bears.

The team heads to Mexico to help desperate owners and their pets; a teenage boy and his sister worry about their sick dog; a remote village has never seen a vet.

Dr. Dee sets off on her first adventure as a new pilot to treat animals in the Arctic Circle; aging Border Collie; disabled Siberian husky.

A large horse may have a deadly problem within; spunky miniature horse is treated; Dr. Dee teaches castration to a new pig farmer; Dr. Terry returns to Fairbanks with a surrendered dog.

A tuxedo cat takes playtime too far, pitting Dr. G against a life-threatening foreign body; a barbecue season corn-conundrum lands a Golden Retriever in urgent care.

A canine's strange appetite delivers a stomach full of surprises; a cat with hair-ific taste leads to a marathon recovery mission; Dr. G's son, Ben, joins him for an action-packed summer.

When a Golden Retriever's tastes go off the beaten track, Dr. G's skills must be rock-solid; Captain the three-legged cat's appetite proves to be as unique as his form; Dr. G's furry family brings a special inspiration to his work and life.

Rocky, a mixed-breed canine suspected of scarfing a purse, deals Dr. G unexpected side dishes; a puppy with a troubled tummy is a head-scratching case from beginning to end.

The Lucas Lagoons crew crafts a bayside paradise for a couple with a home in Snead Island, Fla.; Lucas is frustrated by the challenge of building an outdoor living space without any of his signature rockwork.

The crew creates a huge double-pool feature with a connecting stream and several custom surprises to deliver the wow factor for a couple who have been saving over ten years for a pool.

Conservation Officers statewide join forces with volunteers and the National Guard to launch an intensive search for a missing hiker; Officer McKee gets news of a bear who has infiltrated a home in search of food.

Lt. Boudreau and Officer Hannett have an unusually busy day on ATV patrol; Officer McDermott investigates a man who illegally shot a rabbit in a residential area; Officer Holmes and Officer Cyrs use ATVs to rescue an injured hiker on Mount Carter.

Officer Cyrs gets a call about a rabid fox that attacked a homeowner; Officer Crouse tracks down a group of ATV riders; Lt. Murphy talks to a farmer about a nuisance bear; Officers Frye and Jones investigate a hunter that may have shot from the road.

Officers St. Pierre, Benvenuti and K9 Cora investigate a couple accused of road hunting; an actress tries to perform her way out of a ticket with Officer Hannett; Officer Holmes gets an injured goose call; Officer Frye handles a neighbor dispute.

The Jobbie Nooner event has wardens patrolling the waters of Lake St. Clair; things get interesting when a massive storm rolls in; spring in Michigan can come with major forest fires and the DNR puts all their resources to keep them in check.

Wardens crack down on anglers not following the rules while salmon fishing; a hunter with a checkered past is caught red-handed; beaver dam management calls for some drastic measures; elk hunting season finds eager hunters on their best behavior.

The lives of men and women who are making the Michigan wilderness and landscape a safer place for not only animals, but humans alike.

A hunter who mistakenly takes down an antlered elk must face the consequences; a warden must come down hard on an ORV hunter who is skirting the law; a warden investigates a hunter on private property.

A warden checks on a hunter he suspects may be illegally baiting deer. A warden tracks down hunters using blinds on state land and finds they aren't quite abiding by the law. Wardens enforce the law with anglers on the Detroit River.

Officers encounter many hunters on the opening day of waterfowl season; Chief Haines and his friends enjoy hunting during their annual Grouse Camp trip, and activities heat up on the lake as patrons celebrate the 4th of July.

In Region 7, wardens launch a mission to stop illegal road hunters; the team gathers to celebrate a veteran warden's legacy and reminisce about his long, impactful career.

Region 1 wardens are left speechless after witnessing a squatter on public land and are on high alert during the annual Yellowstone River Boat Float; during the pursuit of upland game, a license check comes up empty and the wardens scramble.

A warden follows the trail to locate a mysterious group of hunters; a warden makes memories to last a lifetime when he draws a coveted mule deer tag; wardens catch illegal hunters in the act during the bighorn sheep and archery elk-hunting seasons.

Wardens help rescue a hunter with a broken leg. Hunters coming through a warden check station get into hot water after not telling the truth. Meanwhile, wildlife decoys are deployed across the state to catch poachers, and it yields surprising results.

A warden follows the trail to locate a mysterious group of hunters; a warden makes memories to last a lifetime when he draws a coveted mule deer tag; wardens catch illegal hunters in the act during the bighorn sheep and archery elk-hunting seasons.

Wardens help rescue a hunter with a broken leg. Hunters coming through a warden check station get into hot water after not telling the truth. Meanwhile, wildlife decoys are deployed across the state to catch poachers, and it yields surprising results.

A warden checks on a hunter he suspects may be illegally baiting deer. A warden tracks down hunters using blinds on state land and finds they aren't quite abiding by the law. Wardens enforce the law with anglers on the Detroit River.

Officers encounter many hunters on the opening day of waterfowl season; Chief Haines and his friends enjoy hunting during their annual Grouse Camp trip, and activities heat up on the lake as patrons celebrate the 4th of July.

An Oregon woman teaches cats how to swim; a San Francisco artisan designs jewelry made out of cat fur; John visits a Los Angeles cat hotel; inventors showcase their improvements on the litter box.

A chef in the Hamptons cooks gourmet meals for felines; a New Jersey fashion designer creates kitty couture.

Tia races to save the life of a dog that's been shot; a scared and sick puppy running loose near heavy traffic is pursued by Matt and Lizzy; Tia faces an agonizing decision after a home inspection raises red-flags.

Parolee is headed down the wrong path, only days after being released from prison; former volunteer comes back to adopt a dog, but her Boxer has other plans.

An old visiting friend of Tia's is quickly thrown into the fire helping with a rescue; former adopter wants to take on another dog; Mondo cares for an injured drop-off while Tia and Louise race to save a loose dog on the interstate.

Maria goes to California to rescue an old friend; a puppy's behavior jeopardizes her chance at a forever home; Tia gets a call for an abandoned pit bull.

Tia and Matt are called upon to rescue some dogs from the home of their recently deceased owner; a potential adopter is looking for a dog who is able to thrive at a bed and breakfast.

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.

It's moving day for Acco, the zoo's biggest crocodile; all goes to plan until his mate Cassie goes into hiding; the team races to reunite the bonded pair in their new enclosure; the rescue unit fights to save a flying fox entangled in barbed wire.

Robert handles an aggressive wombat called Bunker, and it's moving day for a giant anaconda called Nikki. Terri helps treat hundreds of lorikeets injured by a hailstorm. Later, Robert and Chandler team up to bake a special treat for the Irwin ladies.

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

Bindi welcomes the arrival of tiny poison dart frogs to their new home at the zoo; Terri takes charge when the crew moves Bosco out of the Crocoseum; Chandler helps a glider called Kronk.

Carrying three baby kangaroos and an emu, the Irwins caravan into the Australian Outback to release the animals on Mourachan, their giant wildlife conservation property; plans shift when they discover more animals in need of rescue along the way.

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.

"Alaskan Bush People" is a reality-documentary series that introduces the Brown family -- Billy, wife Ami and their seven grown children who -- according to Discovery -- are interesting because "they are unlike any other family in America." The channel says they are so far removed from civilization that they often go six to nine months each year without seeing an outsider. They refer to themselves as a "wolf pack" and, perhaps due to isolation, have their own accent and dialect. The Browns live in the Copper River Valley, where temperatures can drop to 60 degrees below zero, and the family recently relocated and built a cabin there because, they say, their former home of many years was seized and burned down for being in the wrong location on public land.

The Browns meet their match with 75 tons of salvaged old mining equipment as they struggle to place it and get it running.

The Brown family kicks off their most ambitious plan to conquer the mountain yet; Bear and the siblings throw caution to the wind on a critical first project disassembling and transporting a salvaged 50-foot windmill.

When a hungry bear breaks into Noah's tent and spooks the livestock, the Browns suspect it is being attracted by the ranch's newest arrivals -- three young ostriches; the windmill assembly takes the siblings to dangerous new heights.

"Alaskan Bush People" is a reality-documentary series that introduces the Brown family -- Billy, wife Ami and their seven grown children who -- according to Discovery -- are interesting because "they are unlike any other family in America." The channel says they are so far removed from civilization that they often go six to nine months each year without seeing an outsider. They refer to themselves as a "wolf pack" and, perhaps due to isolation, have their own accent and dialect. The Browns live in the Copper River Valley, where temperatures can drop to 60 degrees below zero, and the family recently relocated and built a cabin there because, they say, their former home of many years was seized and burned down for being in the wrong location on public land.

The Browns meet their match with 75 tons of salvaged old mining equipment as they struggle to place it and get it running.

The Brown family kicks off their most ambitious plan to conquer the mountain yet; Bear and the siblings throw caution to the wind on a critical first project disassembling and transporting a salvaged 50-foot windmill.

When a hungry bear breaks into Noah's tent and spooks the livestock, the Browns suspect it is being attracted by the ranch's newest arrivals -- three young ostriches; the windmill assembly takes the siblings to dangerous new heights.

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

Bindi welcomes the arrival of tiny poison dart frogs to their new home at the zoo; Terri takes charge when the crew moves Bosco out of the Crocoseum; Chandler helps a glider called Kronk.

Dexter the dog has serious breathing problems; the team of pickers counting on abandoned storage locker goods gets an unfortunate surprise; Halo the chihuahua discovers more than exercise in the local dog park.

A chihuahua named Rue has a leg injury; having drained his savings, owner Ken is on the verge of surrendering his sick cat, Nagi; the picking team uncovers a bonanza of bikes with an unexpected past.

Officer Joe Canfield investigates a home with multiple bear feeding complaints and finds more than he bargained for; Officer Egan investigates an abandoned car and missing persons case; officers respond to a drowning in the Connecticut River.

Lt. Boudreau and Officer Hannett investigate a possible illegal turkey kill site; Officer Bronson responds to a call about a snake in a bed; Officer Demler confronts a suspect about shooting a turkey on private property.

Officer Canfield breaks up a 45-year-old illegal fishing tournament; Officer MacFadden rescues an injured hawk; Officer Hannett confronts two kids riding OHRVs on the road; on Mt. Chocorua, officers rescue a woman with a fractured ankle.

Lt. Boudreau, K-9 Ruby and Officer MacFadden investigate a hunter suspected of shooting a turkey from the road; Officer McKee searches for a baby owl that fell from its nest; Officer Hannett rushes to lead a carry-out when a hiker suffers an injury.

Officer James Benvenuti chases down two lobster poachers in Rye; Officer Graham Courtney investigates a man on the beach found covered in blood; Sergeant Adam Cheney attempts to apprehend trespassers on the railroad tracks.

Officer Lucas sends a trainee to wrangle his first angry raccoon; Officer Fluette untangles a trapper's web of lies; Officer Benvenuti tries to rescue an injured gosling; Officers Boudreau and Hannett question father and son turkey hunters.

Officer Chris McKee attempts to remove a bear from a tree in a playground; Officer Fluette picks out his new K-9 partner; Officer Lucas searches for a group of ATVs; on the snowy summit of Mount Washington, officers search for lost hikers.

For opening weekend of deer season, game wardens head out around the state to ensure everyone plays by the rules; in East Texas, an injured owl gets rushed to the vet; on the Gulf, game wardens get tough when an oysterman's catch doesn't add up.

Texas Game Wardens relocate a large herd of pronghorn to restore populations in West Texas, investigate the killing of a protected rattlesnake, and wrangle a loose bull; checking hunting camps to ensure no one takes too many whitetail deer.

Down on the Mexican border, game wardens pull in an illegal gill net; a group caught trespassing carries firearms and narcotics; game wardens question a man suspected of illegally hunting on private property.

Texas Game Wardens see plenty of night violations, from road hunters to felons possessing firearms; game wardens stop wildlife crimes with anonymous tips about anglers over their legal limit; a specially trained K-9 unit sniffs out illegal items.

Texas Game Wardens, deep into deer season, investigate a suspected poacher and a felon who shouldn't be using a firearm to hunt; capturing an alligator and her hatchlings must and relocating them from an East Texas school.

The wardens search for an endangered Whooping Crane; a local shop owner finds an injured hawk; responding to call about a nuisance alligator and a potential poacher.

When the Texas game wardens encounter a sick bald eagle, it becomes a race against time to ensure its survival; while checking deer camps near the border of Mexico, a warden finds himself in a high-stakes foot pursuit.

Texas game wardens go on alert after a massive flash flood; game wardens rush to a gas station that could explode; a patrol through the Rio Grande leads to an unexpected encounter; game wardens investigate an illegally killed hawk.

Wardens rush to assist with a capsized canoe; investigating a trapped deer; a warrant goes out for the arrest of a man.

The wardens search for an endangered Whooping Crane; a local shop owner finds an injured hawk; responding to call about a nuisance alligator and a potential poacher.

When the Texas game wardens encounter a sick bald eagle, it becomes a race against time to ensure its survival; while checking deer camps near the border of Mexico, a warden finds himself in a high-stakes foot pursuit.

Texas game wardens go on alert after a massive flash flood; game wardens rush to a gas station that could explode; a patrol through the Rio Grande leads to an unexpected encounter; game wardens investigate an illegally killed hawk.

Wardens rush to assist with a capsized canoe; investigating a trapped deer; a warrant goes out for the arrest of a man.

Texas Game Wardens relocate a large herd of pronghorn to restore populations in West Texas, investigate the killing of a protected rattlesnake, and wrangle a loose bull; checking hunting camps to ensure no one takes too many whitetail deer.

Down on the Mexican border, game wardens pull in an illegal gill net; a group caught trespassing carries firearms and narcotics; game wardens question a man suspected of illegally hunting on private property.

A mystery illness afflicting Ceelo the Doberman puppy has the entire RAPS vet team in detective mode; Cardamom, a Shar Pei puppy, demonstrates why cute can be complicated; the pickers uncover a royal treasure in one of the abandoned bins.

A dog named Goobs wins the RAPS team's hearts; Shadow, a Pitbull mix, has a potentially cancerous lump on his neck; Lilou the cat gets a diagnosis to explain her aggressive and unusual behavior; Karen and her team of pickers hit a jewelry jackpot.

After treating a yoga goat, Dr. Blue brings his best namaste to a herd house call; Dr. Lavigne has his hands full of a trained protection dog who's not a fan of him or the cameras; a party reveals if the Blues will be adding pink to their family.

Bubby Cook, a beloved Basset Hound, has a condition that could complicate surgery for Dr. Ross; Dr. Blue has a hog house call; Dr. Lavigne has concerns over his vet tech assisting with an operation on her own dog; a blackout creates chaos at Cy-Fair.

A dog has chewed off her own tail; a reptile may need a tail amputation; Dr. Lavigne helps Sutter Butter, a cat rescued from being thrown out of a car, and is now having seizures.

Jackson must find space for a vicious cat named Stella who is preventing her owners from expanding their family.

Jackson's expertise is needed when a family is at odds with their cat, Xena, who suddenly became aggressive; a couple rescued a kitten and their cat, Gigi, has gone from sweet and cuddly to dark and dangerous.

A vicious cat named Kleo terrorizes her home, keeping the owners from their wedding day; another couple is desperate for Jackson's help with their cat Marco who tortures their tiny dog Yuki.

Two couples are at their wits end and need Jackson's help to transform their cats. Oscar turns whiny while going back and forth between owners and Riley is destructive leaving his caretakers to delay starting a family.

Polly displays anger by vomiting and attacks as soon as she gets the opportunity; Black Rose and Mathilda battle for control over their keeper's home.

Two couples need Jackson's help against their ferocious felines. Olive and Pepper cannot be left alone in fear that it will end up in a bloodbath; Bengal cat Mufasa is high-energy and uses his owner as a personal clawing board.

Jackson must figure out what is triggering his next feline's aggressive behavior. A crazed cat is enraged by her owners' roommate; a newlywed couple is concerned after their two cats behavior suddenly becomes unruly.

Crippled by injuries and toxic frogs, an adrenaline junkie and a self-proclaimed renaissance redneck must dig deep to try to endure 21 days in Colombia.

A professional boxer and a former cop try to survive 21 days in Africa while threatened by a herd of aggressive hippos.

Three 14-day fan challenge survivalists return to conquer 21 days in the dense South American jungle; when they are hit with torrential rains, they must evacuate from life-threatening flash floods.

After fighting their own demons, two survivalists attempt to endure 21 days in South Africa, where they must contend with man-eating crocodiles, prowling lions and venomous snakes.

Three 14-day fan challenge survivalists return to conquer 21 days in the dense South American jungle; when they are hit with torrential rains, they must evacuate from life-threatening flash floods.

After fighting their own demons, two survivalists attempt to endure 21 days in South Africa, where they must contend with man-eating crocodiles, prowling lions and venomous snakes.

Two couples need Jackson's help against their ferocious felines. Olive and Pepper cannot be left alone in fear that it will end up in a bloodbath; Bengal cat Mufasa is high-energy and uses his owner as a personal clawing board.

Jackson must figure out what is triggering his next feline's aggressive behavior. A crazed cat is enraged by her owners' roommate; a newlywed couple is concerned after their two cats behavior suddenly becomes unruly.

A stray dog arrives at RAPS in rough shape and the team uncovers his surprising story; William, a street-wise cat, amazes Dr. Maldonado with his resilience; Odin, a German Eurasier, heads into surgery; Karen is handed a huge picking challenge.

A black cat with breathing problems gives the vets a run for their money; Bucky, a senior Labrador, takes a frightening turn during surgery; Lucy the Hedgehog surprises her owner with undetected health issues.

Andrea Schlake volunteers at an animal sanctuary when a chimpanzee escapes its enclosure and chases her down; a great white shark knocks surfer Todd Endris off his board and attacks him.

A black bear charges Joe Azzouggagh and his German shepherd, Ace, deep in the Ontario wilderness; single father Andrew Dickehage, forced to walk six miles along a rural road at night, comes under attack from unseen predators.

A polar bear chases down Erin Greene as she walks home from a Halloween party in a small arctic town; a bull shark attacks triathlete Chuck Anderson in the Gulf of Mexico, biting his arm and pulling him to the ocean floor.

The Venom One team encounters a python with a possible family pet in its stomach.

Deadly snake in a mailbox; 12-foot python.

The Venom One team races to contain a 400-pound alligator, angry crocodiles and poisonous snakes.

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

Wade hunts for the Lau-lau, a creature said to swallow men whole.

Jeremy visits a waterfall in the Pacific Northwest where an ancient creature allegedly attacks swimmers.

Jeremy travels to Central America to locate a man-sized beast that reportedly leaps into boats and inflicts devastating injuries upon fishermen.

Jeremy looks into a series of grisly attacks at the site of the world's worst nuclear power plant accident.

Jeremy's quest to locate the legendary Loch Ness Monster takes him from the depths of the Scottish lake to the volcanoes of Iceland.

Wade is on the hunt to find out what was behind the Sobral Santos attack on the Amazon River, where more than 200 passengers were killed on a pitch-black night.

Wade teams up with a local tribe to solve three mysterious deaths in three different South American countries.

Wade faces one of his greatest fears to uncover increasing missing persons cases.

The rivers of Guyana may host a real freshwater mermaid that the locals call the Water Mama.

Wade is on the hunt to find out what was behind the Sobral Santos attack on the Amazon River, where more than 200 passengers were killed on a pitch-black night.

Wade teams up with a local tribe to solve three mysterious deaths in three different South American countries.

Wade faces one of his greatest fears to uncover increasing missing persons cases.

The rivers of Guyana may host a real freshwater mermaid that the locals call the Water Mama.

Jeremy visits a waterfall in the Pacific Northwest where an ancient creature allegedly attacks swimmers.

Jeremy travels to Central America to locate a man-sized beast that reportedly leaps into boats and inflicts devastating injuries upon fishermen.

Dino the dog's anxiety level has the owner sacrificing her own mental health treatments; another dog, Dexter, is becoming increasingly nippy and confused; the final push at Bin City needs to reap big rewards.

Treating their dog's allergy plunges a young couple deep into debt; a hognose snake is reluctant to eat; early plans for a dog sanctuary are riding on a successful, well-attended auction.

A sweet beluga whale trains with staff to go on the whale scale; a Blacktip reef shark L2 is not eating normally and staff work to figure out why; the first sea lion born at the aquarium is a 1-year-old pup named Scarlett.

A southern sea otter is rushed to the health center; the team travels to Key Largo to help coral restoration efforts; young African penguins prepare for an upcoming event; love is in the air for a trainer and his favorite sea lion pup, Scarlett.

Trainers help prepare rescued sea lions for an upcoming eye surgery.

A Florida medical facility desires a tank in the shape of a syringe; the guys must construct an aquarium for their new shop.

The team works its magic on a photo booth and constructs an underwater wonderland in a wing of an Ohio children's hospital.

A Coney Island restaurant desires an aquarium that pays homage to the beach community as it rebuilds in the wake of Hurricane Sandy; a Las Vegas bakery requests a tank for its cake-display case.

Wayde and Brett transport a fully operational beer fermenter, then head south to create a doughnut-shaped tank.

A herd of goats stands in the way of Pete building an elegant English retreat with a luxurious hanging bed on an idyllic farm in Waxhaw, N.C.

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

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.

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.

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.

Pete and his crew trek to the Blue Ridge Mountains to build a tree house for one of their own, carpenter Mike Reynolds; sitting 16 feet high, it makes the perfect rustic guesthouse to host the raucous Appalachian Breaking Up Christmas tradition.

Pete explores tree houses worldwide that tap into one's inner spirits; a manta-ray-shaped tree house within a Thai jungle; a spirit-soothing retreat hidden in Australia's wilderness.

Pete builds a Swiss Family Robinson inspired treehouse in Michigan to help a man surprise his wife for their anniversary; Inspired but far more advanced than the original.

Pete and his crew reminisce about their adventures and answer questions from fans.

Pete and his crew trek to the Blue Ridge Mountains to build a tree house for one of their own, carpenter Mike Reynolds; sitting 16 feet high, it makes the perfect rustic guesthouse to host the raucous Appalachian Breaking Up Christmas tradition.

Pete explores tree houses worldwide that tap into one's inner spirits; a manta-ray-shaped tree house within a Thai jungle; a spirit-soothing retreat hidden in Australia's wilderness.

Pete builds a Swiss Family Robinson inspired treehouse in Michigan to help a man surprise his wife for their anniversary; Inspired but far more advanced than the original.

Pete and his crew reminisce about their adventures and answer questions from fans.

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

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.

Lucas turns a landlocked backyard into a Caribbean destination; when the clients demand that he uses specific materials to create a tropical oasis with a sand bottom and saltwater pool, a battle of wills ensues.

Lucas brings in huge rocks to turn a dull patio pool into a natural atrium while remodeling it to make it child-safe.

A massive prehistoric, crocodilian creature known as the Gbahali kills people in Liberia; it may simply be a case of mistaken identity; it could be a super-sized species of crocodile more akin to a dinosaur than anything known today.

Mungo travels to Namibia to investigate the Dog-Headed Pig Monster, a creature that prowls through the night, preying on livestock and children. After an adrenaline-filled investigation in the African bush, Mungo captures the night stalker on camera.

Staff members devise a treatment for a newborn snow leopard cub struggling to walk; a group of surprisingly adorable Rodrigues fruit bats are trained for a big move.

The last polar bear in New York City shows his age, so staff make sure he gets the attention he needs; a trio of red ruffed lemurs prepare for their big debut; a new exhibit is constructed for the hellbender, a giant amphibian with a bad reputation.

To help love bloom between two kiwis, zoo staff build an elaborate hut into which they introduce a pair of potential mates; a King Cobra arrives at the zoo.

Zoo staff make the journey to East Africa to return to the wild thousands of toads they helped rescue from extinction; Utu, the test-pilot giraffe, tries out a new piece of equipment; the bird department works to save the lives of millions of birds.

The future of the American bison depends on a high-stakes race across the country; the reptile staff have their hands full with a diamond rattlesnake that needs to be medicated orally; training a pair of cheetahs to walk the grounds of the zoo.

A canine with a stomach full of forbidden snacks socks it to Dr. G; a fellow member of the veterinary community fears her dog's symptoms might be due to an off-menu meal, or something worse.

A Husky has been baited by a dangerous nibble; Dr. G must be precise with a Boston Terrier believed to have troublesome objects in its ear and nose; an exotic animal charity inspires Ben to harness humor for a good cause.

A canine's countertop gulp puts Dr. G and Ben on the road to a wholly challenging case; a feline who may have nibbled from a first aid kit presents a dire situation; Ben tries to pull his old school dad into the 21st century with mobile digital gear.

A pet owner who is a nurse gets a front-row seat as Dr. G explores a troublesome appetite; a feline at risk for a dangerous blockage means a high-pressure game of cat and mouse.

Dr. G gets tied up as he unravels the cause of Ivan the cat's questionable mood; a fellow veterinarian calls for help when her beloved Poodle's cough points to foreign material in an unusual place.

One feline has an appetite that's shockingly on the money, while another's taste for stringy oddities appears to be insatiable; while Ben is back home visiting family, an exotic bird with questionable peckishness puts Dr. G out of his comfort zone.

An abandoned puppy is found with a broken leg; the team cares for a seriously ill Boston Terrier; doctors head out to treat rescued pigs.

Dr. Jeff performs a new surgery to save the life of a family's cherished dog; Dr. Baier treats a class act with a big personality; the Planned Pethood team gives puppy mill pups a second shot at life.

An emergency surgery yields a surprising discovery; treating a goat that has been kicked by a horse; a couple travel a long distance to fix their dog's shattered leg; treating an injured ostrich.

A puppy needs a high-risk surgery; a 3-day-old kitten needs immediate help; a deadly virus halves a puppy's chances at life.

Dr. Dee leads a marathon spay and neuter clinic at a laundromat in Ruby, Alaska; Dr. Dee struggles to deliver a calf at one of the largest cattle ranches in the state.

Dr. Dee's dog may have neurological damage; a horse castration becomes complicated; back at the clinic, a potential case of animal neglect may not be what it seems.

An emergency surgery yields a surprising discovery; treating a goat that has been kicked by a horse; a couple travel a long distance to fix their dog's shattered leg; treating an injured ostrich.

A puppy needs a high-risk surgery; a 3-day-old kitten needs immediate help; a deadly virus halves a puppy's chances at life.

Dr. Dee leads a marathon spay and neuter clinic at a laundromat in Ruby, Alaska; Dr. Dee struggles to deliver a calf at one of the largest cattle ranches in the state.

Dr. Dee's dog may have neurological damage; a horse castration becomes complicated; back at the clinic, a potential case of animal neglect may not be what it seems.

A canine's countertop gulp puts Dr. G and Ben on the road to a wholly challenging case; a feline who may have nibbled from a first aid kit presents a dire situation; Ben tries to pull his old school dad into the 21st century with mobile digital gear.

A pet owner who is a nurse gets a front-row seat as Dr. G explores a troublesome appetite; a feline at risk for a dangerous blockage means a high-pressure game of cat and mouse.

Dr. G gets tied up as he unravels the cause of Ivan the cat's questionable mood; a fellow veterinarian calls for help when her beloved Poodle's cough points to foreign material in an unusual place.

One feline has an appetite that's shockingly on the money, while another's taste for stringy oddities appears to be insatiable; while Ben is back home visiting family, an exotic bird with questionable peckishness puts Dr. G out of his comfort zone.

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.

A suspicious encounter in a quiet neighborhood leads wildlife agents to a black market venison sale. A routine boating check ends with a wanted man in handcuffs, and agents launch a massive search for a 93-year-old boater lost.

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.

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 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 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.

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.

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.

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.

The day takes a grim turn when wardens step into the world of "CSI" to determine where a deer was killed; a poaching-loving family is finally going to trial after discovering their responsibility behind multiple animal deaths.

As wardens attempt to catch a convicted game violator, another case forces them to work late into the night; region four officers spring into action when a 1,000-pound bully stirs up trouble.