Mike visits the Happy Trails Kennels in Big Lake, Alaska, where he finds out how to breed and train sled dogs.

While they may seem cute and cuddly, penguins create a lot of very smelly waste which Mike discovers when he heads to Audubon Zoo in New Orleans to work as a keeper for the day.

Wayde and Brett participate in a group dive lesson at the Aquarium of the Pacific; later, they design a tank for international megastar David Hasselhoff; the Hoff hand picks the fish to be used.

A custom tank inside an old fireplace for the founder of vocal group Boyz II Men; building an octopus exhibit for the Greensboro Science Center.

Amanda faces one of her most challenging rescues when a puppy arrives with serious neurological issues; Panda Paws helps a Chihuahua terrier mix bounce back after only having the use of one leg before finding him a forever family.

Amanda teams up again with Tia of "Pit Bulls and Parolees" to help Aiden, a Great Dane mix with a brain issue; she meets Chickpea, a French bulldog with a medical condition that quickly turns into a life or death situation.

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.

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.

Greg and Lucas create a Jurassic-themed enclosure for a blue-tongued skink; Tyrone and Chris construct a versatile enclosure for a reptile rescue that will house a Ball python, Gecko, Bearded dragon, and Uromastyx.

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.

A pregnant African wild dog has the staff anxiously preparing for the big day; zoo director Jim Breheny steps in to help a keeper learn how to handle a golden eagle; a new tree in Jungle World gives the gibbons a fresh world to explore.

Earl and Toney join forces to rescue a canine from an abandoned home; Mariah is forced to make a difficult decision for her fur-baby, Tater.

The Gator Boys leave Everglades Holiday Park; Jimmy locates an alligator ranch in Mississippi; Paul has a big decision to make.

Paul and Jimmy get off to a rocky start in Mississippi; the boys work in sweltering heat to finish a gator pit before the wrestling shows can begin.

The boys rescue a creepy-looking alligator; Jimmy battles a canebrake rattlesnake; Ashley becomes the marketing director of the Gulf Coast Gator Ranch.

The boys search for a legendary 15-foot alligator known as Big Bull; Paul and Chris hope to determine if whips or knives make the better accessory.

Problems with nuisance alligators keep the boys busy; a boy encounters a danger in his pool; Ashley's PR scheme involves Scott dressing in a gator costume.

Paul calls in an expert when Allan and Curtis insist Mississippi alligators are stronger than their counterparts from Florida; Sara feels neglected by Jimmy.

The boys deal with more nuisance alligators; Tre embarks on a mission to locate a legendary creature that supposedly haunts the bayous of Mississippi.

Paul makes a bid that could bring the Gator Boys back to Everglades Holiday Park; a photo shoot involving alligators takes a dangerous turn.

Paul handles an emergency in Florida while the boys work nuisance calls along the Mississippi Gulf Coast; a giant alligator attacks Tre.

Paul calls in an expert when Allan and Curtis insist Mississippi alligators are stronger than their counterparts from Florida; Sara feels neglected by Jimmy.

The boys deal with more nuisance alligators; Tre embarks on a mission to locate a legendary creature that supposedly haunts the bayous of Mississippi.

Paul makes a bid that could bring the Gator Boys back to Everglades Holiday Park; a photo shoot involving alligators takes a dangerous turn.

Paul handles an emergency in Florida while the boys work nuisance calls along the Mississippi Gulf Coast; a giant alligator attacks Tre.

Paul and Jimmy get off to a rocky start in Mississippi; the boys work in sweltering heat to finish a gator pit before the wrestling shows can begin.

The boys rescue a creepy-looking alligator; Jimmy battles a canebrake rattlesnake; Ashley becomes the marketing director of the Gulf Coast Gator Ranch.

A dog that will eat the rug out from under you; a pet anteater; Lucky the dog escape artist.

A dog that goes to great lengths for food; a goose that will bite anyone; the dog with the guiltiest smile.

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.

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

The team builds a Bali-themed enclosure for a blue-tongued skink and gifts the clients an additional enclosure for their crested geckos; Greg surprises long-time client Tonya with a white throat monitor to expand her reptile collection.

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.

The brown bears keep tearing up their exhibit, leaving zoo staff scrambling for a solution; Armani the aardvark gets treated for a tooth infection which has dampened her enthusiasm for digging; a group of burrowing owls prepare to move.

After rescuing 30 hybrid wolf-dogs, Tia, Tania and the twins return to Texas; in the French Quarter, the pandemic forces Tia to shut down her restaurant, and Toney and Earl band together to deliver meals to the elderly using Tahyo Tavern's resources.

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.

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.

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

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.

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

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

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.

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

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

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

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.

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

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.

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.

Sam Brittain and Melanie Croce run Seal Rescue Ireland, the only seal rescue in the entire country; alongside devoted volunteers, they do everything to save and rehabilitate orphaned and injured seals so that they can return to the wild.

After two years of devoted care by Julius, an orphaned baby elephant named Malkia is ready to return to the wild.

A group of four harpooners chase some of the highest-priced fish using only fast boats and aim; Niko must prove he can run a boat while Joe hunts to support his family as the fleet races to land the first bluefin worth thousands.

Captains Joe and Tyler hit bluefin gold as second-generation harpooner, Niko Chaprales, fails to land even one.

Captain Joe Dion takes his sons to sea, landing two bluefins and witnessing a great white shark feeding on a humpback whale.

As the fleet spots the first giants, Joe fights for his lead over Niko and Tyler; all bets are off as old-timer Bill joins the derby; Emmett struggles with the choice to fish without a plane; Dylan gets a $6,000 tuna.

As the bluefin fishery reaches its mid-season peak, three centuries-old fishing strategies compete for dominance; Joe banks on instinct, Tyler uses science to gain the upper hand, and strongman Niko relies on legacy - but nobody relies solely on luck.

Four friends set out on a grueling jungle expedition where they face torrential rains and deadly insects in a quest to verify a rumor of giant golden dorado in an uncharted Bolivian river.

The guys head deep into Zambia in search of large tigerfish and the only things standing in their way are 400 miles of unpaved roads, crocodiles, hippos and a serious lack of fuel.

Dr. Lavigne attacks an older dog's tumors; Dr. Ross tries to save a rabbit's foot mauled by a dog; Dr. Blue takes on a mission to castrate a violent donkey.

A mother dog with two puppies stuck in her uterus needs an emergency C-section; Dr. Ross and Dr. Lavigne address eye issues; vets make a video for the clinic.

Dr. Ross treats baby kangaroos and teams up with the owners of a petting zoo to hold an animal awareness event; Dr. Blue removes a mass from a beloved pit-mix; Dr. Lavigne treats a vision- and hearing-impaired Great Dane.

Dr. Blue recruits Dr. Ross to tackle two wolf spays at a local sanctuary; Dr. Lavigne performs surgery on a pit bull with a torn ACL; new vet Dr. Fedke treats a cat with a creepy, crawly injury.

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 celebration of Dr. Jeff's 30-year career helping pets around the world; a behind-the-scenes look at the clinic where Dr. Jeff and his team remember some of their favorite stories.

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.

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.

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.

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.

A celebration of Dr. Jeff's 30-year career helping pets around the world; a behind-the-scenes look at the clinic where Dr. Jeff and his team remember some of their favorite stories.

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.

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.

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.

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.

A mother dog with two puppies stuck in her uterus needs an emergency C-section; Dr. Ross and Dr. Lavigne address eye issues; vets make a video for the clinic.

Dr. Ross treats baby kangaroos and teams up with the owners of a petting zoo to hold an animal awareness event; Dr. Blue removes a mass from a beloved pit-mix; Dr. Lavigne treats a vision- and hearing-impaired Great Dane.

After two years of devoted care by Julius, an orphaned baby elephant named Malkia is ready to return to the wild.

With the help of her two daughters and husband Phil, Donna Stepan runs Sleepy Burrow Wombat Sanctuary; she takes in a new orphaned baby in critical condition and the next 24 hours become a fight for its life.

Wardens crack down on illegal hunters of shed elk antlers; wardens Schwalm and Holland go out on the game range to look for signs of poachers; wardens assist with walleye spawning.

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 investigate the story of a veterinarian who claims he killed a bear out of season but in self-defense; the waterfowl season opener brings out the hunters in full force and a warden goes undercover to find illegal activity.

A warden follows the trail to locate a mysterious group of hunters; when a warden draws a coveted mule deer hunting tag, he makes memories to last a lifetime; wardens have to ask some tough questions when a large pile of wasted game birds is found.

When wildlife decoys are deployed across the state to catch poachers, the operation yields some surprising results. A warden's trusted K9 helps unearth vital evidence. An investigation into a moose and elk poaching case leads to a major takedown.

Shed antler hunting nearly turns lethal for one man; training for game wardens becomes eerily realistic; one camp of unruly hunters attracts the attention of wardens; when an endangered grizzly bear is shot, wardens come out in full force.

A look at the lives of Montana conservation officers who defend public lands, handle anti-poaching sting operations and more.

A conservation officer responds to an untagged deer case in District One's southern section; a hunter used his girlfriend's tag to continue hunting after tagging a deer of hisown; He's fined, and his rifle, unused tag, and deer are confiscated.

February marks the start of Michigan's rare lake sturgeon fishing season; it's the only time hunters can legally use spears to catch these prehistoric fish; conservation rules are strict-only six fish can be caught from among several hundred anglers.

Michigan conservation officers patrol state land, ensuring hunting blinds are properly marked and removed at season's end; they discover a blind with multiple violations, sparking an investigation into the hunter's compliance with regulations.

Michigan conservation officers monitor elk hunters across early and late seasons; a blind hunter secures a prized bear tag with help from a group of kids and veterans; officers patrol snowmobilers and ice anglers braving frigid conditions.

Officers patrol archery and firearm deer seasons, monitor ORV use, tag suburban ducks, and investigate a buck shot during a coyote hunt, while hunters donate venison to help those in need. Follow Michigan Conservation Officers as they protect and patrol the most precious natural resources in one of the nation's most remote areas.

Follow Michigan Conservation Officers as they protect and patrol some precious natural resources in one of the most remote areas of nation.

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

Officers investigate a timber contract violation and patrol Michigan's deer season; a Warden's videographer joins a DNR program that empowers women to explore outdoor hobbies and conservation.

Officers check deer and waterfowl hunters, a DNR supervisor leads a turkey hunt, and a rehab center works to heal and release injured wildlife.

Follow Michigan Conservation Officers as they protect and patrol some precious natural resources in one of the most remote areas of nation.

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

Officers investigate a timber contract violation and patrol Michigan's deer season; a Warden's videographer joins a DNR program that empowers women to explore outdoor hobbies and conservation.

Officers check deer and waterfowl hunters, a DNR supervisor leads a turkey hunt, and a rehab center works to heal and release injured wildlife.

February marks the start of Michigan's rare lake sturgeon fishing season; it's the only time hunters can legally use spears to catch these prehistoric fish; conservation rules are strict-only six fish can be caught from among several hundred anglers.

Michigan conservation officers patrol state land, ensuring hunting blinds are properly marked and removed at season's end; they discover a blind with multiple violations, sparking an investigation into the hunter's compliance with regulations.

A hungry predator encroaches deeper onto North Star Ranch forcing Bird and Gabe to take strong action; Bam must play nice with his siblings in an effort to finally break ground on his homestead; Gabe has an incredible surprise for the Wolf Pack.

When an ostrich lays its first egg, the Brown siblings rush to figure out how to incubate it; Bear gets a special visit from a young woman on North Star Ranch; the family prepares for a surprise celebration of Billy and Ami's wedding anniversary.

The Browns flee the mountain during a lightning storm in the heat of fire season; to ensure their safety, they devise ingenious new fire safety measures, including a bush alert system and an animal evacuation ark, which they put to the test.

As the siblings race to complete their ambitious water system, Billy gets news that shakes the Wolf Pack and redirects their future; Bear goes on an important hunt during which he reflects on an important life decision.

The Browns begin their ambitious cabin build; Bam and Gabe go on a deer hunt as the family scrambles to pull off the mountain wedding, but days before the ceremony, things take an unexpected turn.

Gabe is attacked by an aggressive ostrich and loses one of his most prized possessions in the process; the ranch gets hit with the first snowfall, the family builds a big bonfire to unfreeze the ground under their house site.

When the ranch comes under fire from encroaching hunters, Gabe takes it upon himself to learn to ride a horse as the family constructs a fence around the property; Gabe and Raquell leave the mountain for the birth of their baby girl.

A life-threatening cold front approaches the mountain, and the family prioritizes shelters for the livestock; the task is easier said than done, as it will require the siblings to make a risky journey to a neighboring mountain to salvage lumber.

A deep freeze halts the water supply, sending the ranch into a new crisis; with a critical load of lumber delivered to the base of their mountain, the Wolfpack must problem solve to get their house back on track.

Rachel, a survivalist from "Naked and Afraid of Love," and Na'im, an outdoorsman from Colorado, take on 21 days in the rugged wilderness of Argentina, but freezing nighttime temperatures may push them to their limit.

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.

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.

In an international tribes challenge, one survivalist must cope with menstruation in the middle of the African bush.

In an international tribes challenge, one survivalist must cope with menstruation in the middle of the African bush.

A superfan teams with a supermom to take on the jungles of Mexico's Yucatán Peninsula for 14 days. Battling brutal storms, ravenous bats and unrelenting hunger, they must rely on sheer grit to survive this fan challenge.

After surviving a 14-day fan challenge, three survivalists attempt to endure 21 days in the rainy, mosquito-infested Belizean jungle; one is forced to leave due to a family emergency.

After surviving a near-fatal fall, an equestrian stunt rider attempts to endure 21 days in Colombia; when she and her partner fail to find food, they must grapple with the harsh possibility of starvation.

A superfan teams with a supermom to take on the jungles of Mexico's Yucatán Peninsula for 14 days. Battling brutal storms, ravenous bats and unrelenting hunger, they must rely on sheer grit to survive this fan challenge.

After surviving a 14-day fan challenge, three survivalists attempt to endure 21 days in the rainy, mosquito-infested Belizean jungle; one is forced to leave due to a family emergency.

After surviving a near-fatal fall, an equestrian stunt rider attempts to endure 21 days in Colombia; when she and her partner fail to find food, they must grapple with the harsh possibility of starvation.

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.

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.

Cats cram themselves into tight spots, hang out with unusual friends, and demonstrate their athletic abilities.

More adorable kitty videos.

Bindi swims alongside whale sharks, assisting with research efforts on the world's largest and least understood fish; Robert works to save an echidna that's tightly trapped under a fridge; Terri joins a close-up exam on a grizzly.

Robert feeds 44 hungry alligators, all at the same time; Terri helps examine Kaitlyn the tiger and makes a thrilling discovery; Bindi follows the heartbreaking story of her old friend, Zambezi the zebra.

Robert and Terri take to the skies to release three rescued sea turtles near the Great Barrier Reef. Bindi anxiously awaits the birth of the zoo's first tiger cub in years. Richie helps a baby wallaby in his struggle for survival.

Robert and Indah, a Komodo dragon, participate in an exciting research experiment; Terri tries to save a koala joey with a zero percent chance of survival; Bindi visits friends at childhood favorite spot Oregon Coast Aquarium.

As Bindi celebrates her 21st birthday, she gets a surprise proposal from her boyfriend, Chandler; things get dangerous as Robert wrangles gators in thick mud; Terri helps with the momentous birth of a baby white rhino.

VRC is at its limit when the amount of rescues and drop-offs rise; Lizzy and Toney travel to a remote part of the city to save a trio of orphaned dogs in a dire state; veteran tenant Lil Rocky faces a cancer scare.

Warden Dudley helps an Amish family save their corn crop from a bear; Wardens Carter and McBrine hunt for a man hiding out in a cabin.

Warden Herring calls in the air wing to help track down illegal activity on a game preserve; Warden Blanchard catches an blatant violator in the act; with warrant in hand, Carter and McBrine search for a known poacher.

An investigation searches for the person who shot a moose and left it in the woods; a camouflaged ATV leads straight to a convicted felon; Warden MacCabe confronts an unusual hunter.

Navigate a mangrove forest in Borneo with the saltwater crocodile, which is perfectly suited to life among the watery roots; discover how this reptile uses the environment to regulate its temperature and why its patience makes it a good hunter.

In Borneo, Max discovers the art of nest making with the jungle's master builder: the orangutan; he escapes the insect-filled floor of the rainforest and takes inspiration from this solitary primate's natural engineering prowess.

Tracking chimpanzees through the Rwandan forest with Max, who tries to convince these powerful monkeys that he's a friend, not a foe; key tips on jungle dining and witnessing complex family dynamics, including grooming and socializing.

A completely new way of looking at the animal kingdom with adventurer, survivalist, and zoology nut Max Djenohan. Max is on a mission. To unlock and mimic the survival skills of some of the most charismatic animals on Earth.

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

Jeremy Wade is lured to the shores of the Mekong River in Cambodia to search for a monstrous fish that has mauled, blinded, killed and most recently sliced clean through a young man's testicle.

Tracking chimpanzees through the Rwandan forest with Max, who tries to convince these powerful monkeys that he's a friend, not a foe; key tips on jungle dining and witnessing complex family dynamics, including grooming and socializing.

A completely new way of looking at the animal kingdom with adventurer, survivalist, and zoology nut Max Djenohan. Max is on a mission. To unlock and mimic the survival skills of some of the most charismatic animals on Earth.

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

Jeremy Wade is lured to the shores of the Mekong River in Cambodia to search for a monstrous fish that has mauled, blinded, killed and most recently sliced clean through a young man's testicle.

Warden Herring calls in the air wing to help track down illegal activity on a game preserve; Warden Blanchard catches an blatant violator in the act; with warrant in hand, Carter and McBrine search for a known poacher.

An investigation searches for the person who shot a moose and left it in the woods; a camouflaged ATV leads straight to a convicted felon; Warden MacCabe confronts an unusual hunter.

Countdown of the cutest viral video clips of superstar pups.

Exploring the canine kingdom; cute dogs; latest videos of guilty pooches; mutts with unusual pals.

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 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.

Greg and Lucas visit the Moorehouse family who want an Old West saloon-themed enclosure for their first reptile; Tyrone, Jason, Chris, and Lucas have a competition to see who creates the funniest memes.

Dave, a kangaroo suffering from chronic arthritis, tries cryotherapy; a large group of rambunctious gharials are trained to patiently wait for their food; a tiny pygmy marmoset gives birth to an even tinier baby.

The slow loris has a tiny window for breeding, so staff anxiously help a potential pair connect; the veterinary team develop ground-breaking techniques to treat the stoic pigeons; an okapi with a limp gets a helping hand.

At a Mississippi shelter, Tia gives a hybrid wolf-dog a second chance; at the vet, Lizzy is forced to make a tough call for a new VRC resident and later helps a pair of hearing-impaired canines; a California man visits to find a fur-friend.

Brett and Wayde build a creepy skull themed tank for former Guns N' Roses, BulletBoys and current Sixx A.M. guitarist, DJ Ashba.

ATM constructs an aquarium of the glowing Atlanta skyline for rap superstar 2 Chainz.

Latin music star Prince Royce wants a custom aquarium for his Miami mansion.

Emma is faced with an emergency patient; Emily has a hard decision to make when a cape buffalo is seriously injured; Anna hopes to help dehorn five white rhinos to make them less valuable to poachers.

Emma looks after Mars the aardvark who demands five-hour walks every night; Josie has her work cut out as an injured vervet monkey is rushed in after being run over; the time has come to dehorn five previously released white rhinos.

Harriet is called out to an emergency operation on an elephant whose leg has been wounded; volunteer Debbie is put to the test as nine orphaned baby monkeys arrive at once, and Emma becomes surrogate mother to three-week-old baby hippo Hector.

Following the vets and volunteers of South Africa who rescue extraordinary animals.

Mike travels to Mississippi, to spend a day at an old-fashioned stone ground corn mill; then he heads to Texas, to help relocate a pair of exotic Pere David's deer.

Mike heads to a unique dairy farm in Ramona, Calif. where he learns how to milk, care for and breed dromedary camels.

Harriet is called out to an emergency operation on an elephant whose leg has been wounded; volunteer Debbie is put to the test as nine orphaned baby monkeys arrive at once, and Emma becomes surrogate mother to three-week-old baby hippo Hector.

Following the vets and volunteers of South Africa who rescue extraordinary animals.

Mike travels to Mississippi, to spend a day at an old-fashioned stone ground corn mill; then he heads to Texas, to help relocate a pair of exotic Pere David's deer.

Mike heads to a unique dairy farm in Ramona, Calif. where he learns how to milk, care for and breed dromedary camels.

ATM constructs an aquarium of the glowing Atlanta skyline for rap superstar 2 Chainz.

Latin music star Prince Royce wants a custom aquarium for his Miami mansion.

A dog that doesn't know when to stop; a turtle that refuses to slow down.

A piano-playing dog; a pet buffalo; a dog that will eat everything.

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.

The team is determined to have Gibson the sea otter pup discover his independence as he separates from his pal, Mara; the African penguins head off-site for spring cleaning; Thor the moray eel proves he's the ultimate escape artist.

The squirrel monkeys play hard-to-get with the Children's Zoo's keepers; a pair of Komodo dragons meet for the first time, with explosive results; the Inca terns prepare for their first big flight.

A markhor goat gives birth to Andre, the biggest baby of the year; a baby bat requires human care before it can be reintroduced to its colony; confiscated lizards destined for the pet trade require urgent medical attention.

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.

On the streets of New Orleans, the VRC crew is on a mission to catch a runaway dog; a Californian family wants a new furry family member; a paralyzed pup named Polly takes a trip to the vet; Mariah pitches a fundraising idea to the parolees.

The boys deal with more nuisance alligators; Tre embarks on a mission to locate a legendary creature that supposedly haunts the bayous of Mississippi.

Paul makes a bid that could bring the Gator Boys back to Everglades Holiday Park; a photo shoot involving alligators takes a dangerous turn.

Paul handles an emergency in Florida while the boys work nuisance calls along the Mississippi Gulf Coast; a giant alligator attacks Tre.

The boys must catch several large alligators and teach the Mississippi crew wrestling moves before they can return home to Florida; Paul has a dangerous underwater encounter.

The boys battle a multitude of nuisance gators; Ashley suspects her job is in jeopardy; Paul tries to teach Kayla how to catch alligators by hand.

The boys must repair their old enclosures at Everglades Holiday Park to make space for endangered alligators; Tre is hired as an airboat captain, but soon wrecks his vessel.

Paul and Jimmy encounter unusually large and ferocious gators; Tre buys a metal detector and soon gets carried away with his hunts for buried treasure.

The boys make a capture on a golf course; a teen who lost an arm in an alligator attack hopes to overcome his fear of the creatures; Scott seeks revenge on Ashley.

Gator wrestlers reunite at Native Village, where Paul encounters a 14-foot, 1,500-pound nemesis; Jimmy is reminded of the death of his friend and mentor, Michael "Skeet" Johns.

The boys must repair their old enclosures at Everglades Holiday Park to make space for endangered alligators; Tre is hired as an airboat captain, but soon wrecks his vessel.

Paul and Jimmy encounter unusually large and ferocious gators; Tre buys a metal detector and soon gets carried away with his hunts for buried treasure.

The boys make a capture on a golf course; a teen who lost an arm in an alligator attack hopes to overcome his fear of the creatures; Scott seeks revenge on Ashley.

Gator wrestlers reunite at Native Village, where Paul encounters a 14-foot, 1,500-pound nemesis; Jimmy is reminded of the death of his friend and mentor, Michael "Skeet" Johns.

Paul makes a bid that could bring the Gator Boys back to Everglades Holiday Park; a photo shoot involving alligators takes a dangerous turn.

Paul handles an emergency in Florida while the boys work nuisance calls along the Mississippi Gulf Coast; a giant alligator attacks Tre.

From a truck honking delivery dog to a monkey with plenty of attitude to a sleep walking dog that runs into walls, see just how far pets can push their owners and still get unconditional love.

Bad Dog! documents just how far pets can push their owners and still get unconditional love.

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.

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.

When keepers introduce two tigers as potential mates, the process proves bumpy; a pair of African porcupines arrive at the zoo, requiring delicate handling; a pregnancy check on a 3,000-pound rhino necessitates some highly specialized equipment.

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.

Peaches, a 2-month-old warthog, charms his keepers while training to become an animal ambassador; a nervous one-horned rhino adjusts to her new exhibit; Willow, a red panda, shows signs of being pregnant.

Now a mother of two, Lizzy leans on Tia to help find a work-life balance; a California couple hopes to adopt a dog that will be comfortable in the pool; Mariah's mission to save an injured dog leads her to something completely unexpected.

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 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.

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

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 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.

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

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 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.

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

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 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 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.

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

After two years of devoted care by Julius, an orphaned baby elephant named Malkia is ready to return to the wild.

With the help of her two daughters and husband Phil, Donna Stepan runs Sleepy Burrow Wombat Sanctuary; she takes in a new orphaned baby in critical condition and the next 24 hours become a fight for its life.

As the bluefin fishery reaches its mid-season peak, three centuries-old fishing strategies compete for dominance; Joe banks on instinct, Tyler uses science to gain the upper hand, and strongman Niko relies on legacy - but nobody relies solely on luck.

With the advantage of spotter planes, veteran Tyler and young gun Joe battle for the most monster bluefin until Joe helps strongman Niko get back into contention; when Niko's zapper fails, Tyler steps in to save the day.

As the giant bluefin gorge themselves on schools of fatty baitfish, captains battle to capture oversized quota-killer tuna; young gun Joe scores a rare feat by landing three in a day; veteran Tyler struggles with both science and technology.

With less than a quarter of the bluefin quota still available to catch, a change in weather forces captains to shift their strategy; Tyler quickly scores three big fish; Joe takes to the air, he spots a lone tuna, then races to find it at sea.

Captains Joe and Tyler are in a heated battle in the season finale; fighting for the top spot, dark horse Niko spots a chance to steal the lead; with the biggest catches of the season yet to come, it all comes down to the final weigh-ins at the dock.

The guys discover Greenland is wilderness at its most pure - and most dangerous - when they follow a lead to an extremely remote river believed to hold massive Arctic char.

The crew heads to Mongolia in search of taimen, the largest, most ferocious member of the salmon family.

A health scare ends Dr. Blue's dreams of motorcycle riding with his brother; Dr. Ross treats a sweet bearded dragon laying bad eggs; Dr. Lavigne must determine what to do about a large tumor taking over a boxer's toe.

A mother dog with two puppies stuck in her uterus needs an emergency C-section; Dr. Ross and Dr. Lavigne address eye issues; vets make a video for the clinic.

The doctors all want to be the one who goes to a vet conference in San Diego; Dr. Ross treats a young kinkajou, while Dr. Blue treats a Min Pin's drop-dead breath; Dr. Lavigne suspects a cat has a contagious disease.

Yuki the bulldog ate something she shouldn't have and it's up to Dr. Blue to find it; Dr. Lavigne and his wife learn how to do alternative home care on Suki, an amputee rescue cat his family adopted.

After treating a yoga goat, Dr. Blue brings his best namaste to a herd house call; Dr. Lavigne has his hands full with 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.