Era Alaska ferries fire crews to combat raging wildfires; Ponts has to navigate the deadly Merrill pass.

Building a skate park on Unk's newly paved roads; Ariel's flight in a new plane leads to danger; pilot Erik Snuggerud battles heavy turbulence.

Pilots try to fly 1,600 pounds of volatile propane to an isolated fishing lodge; Luke Hickerson battles failing equipment; Ponts challenges Ariel to make a perfect landing.

Sarah Fraher faces her first flight in a 208; Ariel hunts for seagull eggs midair; Erik fights to keep his plane aloft.

Era Alaska ferries fire crews to combat raging wildfires; Ponts has to navigate the deadly Merrill pass.

Terri and Bindi witness and help with a complex koala surgery.

A group of rock climbers arrive in Unk and Jim must fly them deep into the remote Brooks Range; to feed their hungry community, Luke flies a Barrow whaling crew over the sea ice in search of a site to hunt the Bowhead whale.

Oreo the tiny tuxedo kitten meets a smelly look-alike; Russian Blue siblings go on an adventure; Freckles the Ocicat tries to control five little jungle cats.

A pit bull puppy learns to walk; Chinese crested puppies investigate a turtle; a newborn collie overcomes her shyness.

Officers Bill Boudreau and Eric Hannett investigate a man raising alligators in the attic of his home; as night falls over the White Mountains, Officers Glenn Lucas and Eric Fluette ascend into the darkness to rescue a lost group of hikers.

When an out-of-state hunter appears to lie about the circumstances surrounding his deer kill, Officers Bob Mancini and Kevin Bronson investigate; conservation officers work with volunteers to recover the body of a missing hiker on Mount Washington.

Officers Adam Cheney and Geoff Pushee run into an aggressive and angry hunter while investigating a road hunting complaint; an elderly man with dementia goes missing in the swamp.

Officer Glen Lucas races to the scene of an ATV accident; a home is broken into so Officers Bill Boudreau and Eric Hannett assist police in tracking the suspect; Officer Bob Mancini tries to save the life of an injured loon.

Murphy and Demler investigate a suspicious turkey kill while Courtney rescues a scared fawn near a busy road. Meanwhile, Lucas races to save a sick loon.

Officer Glen Lucas intervenes when a black bear cub gets separated from its mother and wreaks havoc on a small community; as heavy rains cause rivers to flood, Officer Eric Fluette races to rescue a man whose canoe has flipped in the rapids.

Officer Glen Lucas treks to the summit of Mount Washington to rescue an injured hiker; officers track down a trio of possible deer poachers; officer Ron Arsenault investigates a tip about an illegal bobcat trapper.

When an elderly man goes missing in a vast wilderness area, wildlife agents race to find him before nightfall; a tip leads agents to a haul of undersized redfish and anglers who refuse to confess; bloody evidence ties a trespasser to an illegal deer.

Wildlife agents interrogate a felon caught hunting with a firearm; witnesses report a hunter trying to bludgeon a swimming deer from his boat; a duck shot out of season leads agents to a slew of violations.

A barrage of heavy gunfire in an archery-only area puts wildlife agents on high alert; two boaters are stranded on Catahoula Lake; a hunter is caught in an act of fraud; a veteran agent encounters a high-stakes violation on his final patrol.

When wildlife agents find an alligator with a fresh bullet wound to the head, nearby anglers are the prime suspects; an injured hunter must be evacuated by helicopter; agents use drones to track crabbers selling their catch across state lines.

LDWF biologists undertake an explosive mission to help conserve Louisiana's wild turkeys; a suspicious deer skull points to a hunter flouting the law; more than 1,000 lbs of shrimp are at stake when a captain is caught in a major violation.

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.

Wildlife agents question a hunter with something to hide and notice damning evidence on his person; a group of youths shooting ducks from a moving boat is caught in the act; frightened hunters accuse a landowner of serial harassment.

Wildlife agents join a manhunt for an armed fugitive on the bayou; a nervous young hunter reveals a serious violation; a night shrimping bust leads to a familiar and unrepentant culprit.

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.

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.

Wildlife agents question a hunter with something to hide and notice damning evidence on his person; a group of youths shooting ducks from a moving boat is caught in the act; frightened hunters accuse a landowner of serial harassment.

Wildlife agents join a manhunt for an armed fugitive on the bayou; a nervous young hunter reveals a serious violation; a night shrimping bust leads to a familiar and unrepentant culprit.

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.

Wildlife agents interrogate a felon caught hunting with a firearm; witnesses report a hunter trying to bludgeon a swimming deer from his boat; a duck shot out of season leads agents to a slew of violations.

A barrage of heavy gunfire in an archery-only area puts wildlife agents on high alert; two boaters are stranded on Catahoula Lake; a hunter is caught in an act of fraud; a veteran agent encounters a high-stakes violation on his final patrol.

A peppy aunt coaxes a Cavalier King Charles spaniel out of her shell; Alaskan malamutes compete to be top dog; three fire-station Dalmatians display their skills.

Nanook, a shy Chinook, is the only boy in a litter of four and is training to be a sled dog; Rocky the Labradoodle and his brother Stanley grow up poolside.

The clinic takes in displaced animals during the massive flooding in Houston; Dr. Blue helps a puppy with a deadly disease acquired from standing water; Dr. Lavigne and Dr. Ross examine a wandering tiger.

Dr. Ross performs surgery on a second-chance pup; Dr. Lavigne checks up on a prickly pet; Dr. Blue treats an injured owl, then joins Dr. Ross in checking on a cute litter of sick, tiny piglets.

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.

Reality star Adrianne Curry and her boyfriend, Todd are living with Adrianne's menacing Siamese cat, Billy Shears; a college student feels like she is being held prisoner by her bloodthirsty feline, Storm.

Jackson comes to the defense of Good Kitty, a feline who he must help stand up to her two feline attackers; the Cat Daddy also meets a couple fed up with the way their cats, Tiki and Marley, eat everything in sight.

Jackson deals with the drama of a house divided where four cats are constantly at each other's throats; territorial issues force two cats to live in isolation for years at the Living Free Animal Sanctuary's cattery.

Jackson works on the behavior of a hyperactive cat named Mr. Weasley. However, when this Persian cat goes down mid-play, the story takes a completely different turn. Jackson also figures out how to move an exiled cat indoors.

A couple fear having a child because of their aggressive cat, Martini; Jackson tries to keep the peace between a pair of cats who constantly fight, most often in the kitty litter.

Jackson works with a couple with a blind cat suffering from living in a chaotic environment; a Jekyll-and-Hyde-esque cat named Jude acts friendly during the day, but becomes a nightmare at night.

A circus performer and an avid hunter take on 14 days in the untamed jungle of Tobago; an injury threatens their challenge.

An expert hunter and an Air Force veteran attempt to survive in Zambia, where they are preyed upon by deadly lions, aggressive baboons and elephants.

After poisoning the water in her fan 14-day challenge, survivalist Ashley seeks redemption in Tobago with a new partner, but making it to 21 days in a rain-sodden jungle will push them beyond their limits.

A wilderness guide and a software engineer diagnosed with Asperger's try to survive in the Botswana desert; herds of aggressive elephants threaten their security at night, but their biggest hurdle is learning to communicate with each other.

After poisoning the water in her fan 14-day challenge, survivalist Ashley seeks redemption in Tobago with a new partner, but making it to 21 days in a rain-sodden jungle will push them beyond their limits.

A wilderness guide and a software engineer diagnosed with Asperger's try to survive in the Botswana desert; herds of aggressive elephants threaten their security at night, but their biggest hurdle is learning to communicate with each other.

A couple fear having a child because of their aggressive cat, Martini; Jackson tries to keep the peace between a pair of cats who constantly fight, most often in the kitty litter.

Jackson works with a couple with a blind cat suffering from living in a chaotic environment; a Jekyll-and-Hyde-esque cat named Jude acts friendly during the day, but becomes a nightmare at night.

A Shar-Pei keeps his toys away from his siblings; a young cairn terrier sets off on an adventure; a tiny boxer's grandfather steers him toward glory.

Nine keeshond puppies try to befriend a flock of ducks; a young Great Dane tries to adjust to his growing body; five cocker spaniel siblings exhibit different personalities.

Gators turn up everywhere, from backyard pools to bathrooms.

Pythons in the Everglades.

After a python eats a gator, many theories about the battle are developed. African Rock pythons are becoming a problem in the suburbs of Miami.

Forrest is in the Galápagos seeking the Fernandina tortoise, an animal that was only seen once, over 100 years ago; the clues are here, along with an abundance of unique species, raising hopes of a historic discovery.

Forrest Galante visits the island of Java in Indonesia to look for the Javan Tiger; this exotic predator was declared extinct in 2003, but park rangers and locals have had recent sightings and are collecting evidence of its existence.

After numerous credible eyewitness accounts of the Tasmanian Tiger in Australia, James Cook University has researchers on the move; Forrest joins their study before heading deep into the Cape York Peninsula.

Madagascar's Pachylemurs were red, furry giants, nearly the size of great apes; recently discovered remains disprove that they went extinct 1,000 years ago; Forrest tries to prove the giant species still lives.

Jeremy Wade travels to the Sepik River in New Guinea to investigate a creature suspected of taking the lives of at least two fishermen.

Jeremy travels to the Amur River in eastern Russia, where a mammoth predator is allegedly responsible for the disappearances of three fishermen.

Jeremy Wade searches for a two-hundred year old legend.

Jeremy Wade travels to Japan, searching for two legendary monsters.

Jeremy Wade sets out for South America to find a monster.

Jeremy Wade is in Brazil, searching for a river monster that has killed three cowboys.

In a remote corner of Argentina, Jeremy Wade investigates the death of a young girl.

Angler Jeremy Wade heads to the Australian outback to try and catch the rare and fearsome freshwater sawfish, a shadowy predator said to be 18 feet long and known to attack boats.

Jeremy searches for a modern-day "Jaws" in Florida's Indian River Lagoon and investigates underwater predators in Missouri's Lake of the Ozarks.

Jeremy Wade is in Brazil, searching for a river monster that has killed three cowboys.

In a remote corner of Argentina, Jeremy Wade investigates the death of a young girl.

Angler Jeremy Wade heads to the Australian outback to try and catch the rare and fearsome freshwater sawfish, a shadowy predator said to be 18 feet long and known to attack boats.

Jeremy searches for a modern-day "Jaws" in Florida's Indian River Lagoon and investigates underwater predators in Missouri's Lake of the Ozarks.

Jeremy travels to the Amur River in eastern Russia, where a mammoth predator is allegedly responsible for the disappearances of three fishermen.

Jeremy Wade searches for a two-hundred year old legend.

A tiny beagle proves his worth to his much-bigger sisters; bichon frisé puppies follow their mother's example to show-dog stardom; one young Doberman pinscher stands out from his eleven siblings.

Five small piglets befriend the family dog; energetic Mini Lop rabbits grow into their ears; three baby hedgehogs find adventure in the great outdoors.

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.

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

Wayde and Brett attempt to create a unique, enormous, ship-shaped tank with a replica of the USCGC Mohawk for the Imaginarium Science Center.

ATM builds a Smile More aquarium for YouTube superstar Roman Atwood; but a shop prank almost tanks the whole project.

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

Two retirees get a retreat on their 100-acre Wisconsin farm; Pete builds a barnlike birdhouse with three separate pods -- an art studio, an office and a lounge -- complete with a screened-in porch and a deck overlooking their stable of alpacas.

Pete travels to Alaska to build a mountaineering lodge in the shadow of North America's highest peak; constructing an A-Framed masterpiece for the Mt. McKinley Princess Wilderness Lodge with breathtaking views of Denali.

When asked in 2016 what she would do with her winnings, "America's Got Talent" Season 11 winner Grace VanderWaal said she wanted a tree house built by Pete Nelson; the 13-year-old singer-songwriter's wish comes true.

Pete has one week to build a Christmas-treehouse wonderland in the desert outside Jamul, Calif., for a family who celebrates Christmas 365 days a year; members of the Fraternal Order of Real Bearded Santas lend a helping hand.

Pete builds a butterfly-themed treehouse that includes six trees in Independence, Ohio, for a hope center that wanted a therapeutic space within the trees.

Adventure-themed treehouse with suspension bridges, rock-climbing wall and hidden passages is built in the Pocono Mountains.

The team attempts to construct a chic but Bohemian tri-level, 60-foot-high treehouse in three giant redwoods for an arborist in Humboldt County, Calif.

Pete creates his first-ever midcentury decagon when he builds a tree house to observe bears in Farmington, Pa. -- complete with walls of glass windows and a "bear-cam" tracking system.

A couple dreams of having a treehouse atop a lighthouse in Washington, and Pete finds the property's steep grade challenging.

Adventure-themed treehouse with suspension bridges, rock-climbing wall and hidden passages is built in the Pocono Mountains.

The team attempts to construct a chic but Bohemian tri-level, 60-foot-high treehouse in three giant redwoods for an arborist in Humboldt County, Calif.

Pete creates his first-ever midcentury decagon when he builds a tree house to observe bears in Farmington, Pa. -- complete with walls of glass windows and a "bear-cam" tracking system.

A couple dreams of having a treehouse atop a lighthouse in Washington, and Pete finds the property's steep grade challenging.

Pete travels to Alaska to build a mountaineering lodge in the shadow of North America's highest peak; constructing an A-Framed masterpiece for the Mt. McKinley Princess Wilderness Lodge with breathtaking views of Denali.

When asked in 2016 what she would do with her winnings, "America's Got Talent" Season 11 winner Grace VanderWaal said she wanted a tree house built by Pete Nelson; the 13-year-old singer-songwriter's wish comes true.

A dedicated caregiver gets her lifelong wish of having her own pool; Lucas faces the pressure of not only building a dream pool, but has to create it in a small backyard; the team transforms the family's yard into a little oasis with big potential.

Lucas is tasked with the project of repairing and remodeling an unusable pool for a famous golfing family; puzzled as to how this pool was even built, Lucas creates an ocean-themed pool with fire features, an infinity edge, and his first water couch.

In the heart of Mozambique's Zambezi Delta, a team of conservationists has overseen one of the largest range expansions of African lions in modern times. Following the reintroduction of 24 lions in 2018, the population has grown to over 100 today.

A look at why a raccoon would scale a 25-story skyscraper, why one mother duck would have a super-sized flock of 76 ducklings, and what would motivate a bird to feed a school of fish.

Investigating a bigfoot-like creature with superhuman strength reported in the foothills of the Andes; Mungo hears chilling yet conflicting stories on the Ucumar: some believe the creature is a bear, while others think it's more of a yeti.

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.

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.

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.

A trio of new penguin chicks are introduced to the pool for their first swim; family dynamics change when the mandrill monkey troop welcomes a new baby; a pair of king vultures are prepped for their big debut at the Queens Zoo.

Keepers introduce three gaur, a large species of cattle, to the rest of the herd; a sickly sambar fawn is rushed to the health center; the bird department prepares for the arrival of great hornbills.

Dr. Jeff discovers a large mass on a lovable canine; Dr. Don helps Kelly the vet tech with her dog's sun-damaged nose; Dr. Baier and Hector join forces to treat wild bison.

Dr. Jeff and Ben head to an island in Panama to help with the pet population; a terrier loses a battle against a German shepherd puppy, and a sickly sphinx kitten needs medical attention.

Dr. Jeff performs surgeries with the help of two vet students; a tribe of fainting goats is seen by Dr. Jeff and Hector; Dr. Amy discovers why a cute and cuddly kitten is teary-eyed.

Coco the Frenchie needs Dr. Jeff's help to remove a large lump from her face; vet tech Christine faces her fear of birds while helping pigeons from Rocky Mountain Adventures; Drs. Jeff and Baier aid a red-back turtle with an infected foot.

A dog named Mac is rushed in after being hit by a car; Dr. Amy performs surgery on a dog named Rebel who was impaled with a stick, while Dr. Baier helps Kino, a hound in heat.

Dr. Jeff battles to save a beloved dog whose leg has been shattered by a car; Dr. Amy attempts to treat seven ill-tempered chickens; the entire staff pulls together to save a baby kitten found unconscious at a construction site.

A young dog suffers a broken leg after jumping out the back of a pick-up truck; a cat gets injured fighting its neighbor's dog; Dr. Jeff helps a rescued fox from the Rockies; rushing to save the pet hedgehog of a fourth-grade class.

Dr. Dee and Ken head to Eagle, Alaska, to host a vet clinic; dog that suffered a vicious attack needs emergency surgery; Dr. Dee contemplates a lovesick turtle mystery; checking a rancher's cows for pregnancy.

Animal House gets busy as Dr. Dee must deal with a Chihuahua with a life-threatening condition, trim the beak of a vocal Macaw, and treat a deathly ill newborn calf; Dr. Dee and Ken add seven fainting goats to the family at home.

Dr. Jeff battles to save a beloved dog whose leg has been shattered by a car; Dr. Amy attempts to treat seven ill-tempered chickens; the entire staff pulls together to save a baby kitten found unconscious at a construction site.

A young dog suffers a broken leg after jumping out the back of a pick-up truck; a cat gets injured fighting its neighbor's dog; Dr. Jeff helps a rescued fox from the Rockies; rushing to save the pet hedgehog of a fourth-grade class.

Dr. Dee and Ken head to Eagle, Alaska, to host a vet clinic; dog that suffered a vicious attack needs emergency surgery; Dr. Dee contemplates a lovesick turtle mystery; checking a rancher's cows for pregnancy.

Animal House gets busy as Dr. Dee must deal with a Chihuahua with a life-threatening condition, trim the beak of a vocal Macaw, and treat a deathly ill newborn calf; Dr. Dee and Ken add seven fainting goats to the family at home.

Dr. Jeff and Ben head to an island in Panama to help with the pet population; a terrier loses a battle against a German shepherd puppy, and a sickly sphinx kitten needs medical attention.

Dr. Jeff performs surgeries with the help of two vet students; a tribe of fainting goats is seen by Dr. Jeff and Hector; Dr. Amy discovers why a cute and cuddly kitten is teary-eyed.

The crew heads to Plantation, Fla., to bring Costa Rica to a young family's home; Lucas builds the ultimate jungle backyard that includes a beach volleyball court, a huge swim-in grotto and a spa complete with a giant water wall and a rain curtain.

Lucas is tasked with creating a Mediterranean backyard resort with a Caribbean twist for a client's wedding anniversary; the team builds a paradise dream complete with a 30-person infinity edge spa, over 10 fire features, and an outdoor gym.

A landowner is spoken to for a second time about illegal hunting; an injured deer is found hiding in a shed; wardens notice a suspicious driver hiding something under his seat.

Anglers are out all over Texas; in Houston County, a game warden returns after a life-threatening injury; along the coast, fishermen get caught with too many sharks; a protected turtle gets relocated, and anglers on the Gulf learn how to tag fish.

Warden Eddins assists the local police with an animal cruelty case; a trespassing dispute; relocating a snapping turtle; cracking down on fishermen.

A hunter is confronted for killing a deer with a gun during bowhunting season; a man is questioned for possessing venomous copperhead snakes; while checking bowhunters at night, a game warden helps find an injured hunter.

A deer poacher is busted, a baby rattlesnake is rescued, a hummingbird evades capture, and a raccoon is released into the wild; the wardens also respond to flooding conditions and a car accident.

In Liberty County, the death of a deer is investigated; fawns in Harris County are being illegally kept as pets; patrol on Somerville Lake leads to multiple citations; a suspicious car is stopped in Red River County.

It's the opening of deer and oyster season in Texas and Game Wardens find illegal undersized oysters; in East Texas, Game Wardens patrol deer camps; an owl is rescued from a chicken coop and set free.

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.

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 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.

The wardens of Region 1 and 3 set off to educate the public on Montana's aquatic invasive species population. Meanwhile, a tribute is made for one of Montana's honorary wardens.

Wardens stumble upon a heated situation on the side of the road; Lesofski searches for the culprit behind an elk carcass; a riverside check station cites four minors under the influence; underage drivers are caught behind the wheel.

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.

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 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.

A young Pomeranian befriends baby chicks; two Ibizan hounds compete for attention; a mixed-breed puppy takes his sister on an adventure.

Himalayan kittens encounter another regal resident; a Singapura can't keep up with her babies; short-legged Munchkins explore the world.

Tia and Country Matt team up to rescue an aggressive dog; a local law student wants to adopt a dog that can go running with her; a dog is brought in with a serious skin condition and tumors.

Tia and her kids race to rescue a stray dog near a busy highway; an adoption requires some temperament testing when a trucker wants to adopt a dog to join him on the road; a return adopter seeks out a senior dog.

Villalobos is invited to participate in Dog Bowl, creating a chance for a handful of dogs to steal the spotlight; M2 helps a neglected dog left in horrible conditions; a couple take the first step towards becoming parents by adopting a dog.

A potential adopter wants to give a senior dog that has only known life in a kennel a forever home; M2 and Kanani find a box of puppies in a field; Matt and Earl head to the kitchen to cook some fresh food for a sick dog.

As the new VRC location nears completion, Tia and the team prep to welcome the public for a volunteer day; an Ohio couple feels a powerful connection with deaf dog Ben; Mariah draws on her passion for motorcycles to honor her beloved pit bull Tater.

An anxious Robert looks on when Indah the Komodo Dragon meets Gili, an aggressive potential mating partner; Terri handles a lump inside Jessie the woma python.

Robert continues his father's legacy as he faces off with Bosco, the most aggressive croc at the zoo; Bindi lends a hand when a koala needs eye surgery.

The Irwins go to the Steve Irwin Wildlife Reserve; Robert leads his first croc-catching team; Bindi and Chandler have a life-changing announcement.

The zoo welcomes four Sumatran elephants; Robert and Terri try to guess the gender of Bindi's baby, but Bindi and Chandler have their own surprise in store.

Bindi and the zoo welcome two baby echidnas; health concerns become a major threat for one puggle's survival; a jabiru goes missing.

Twetos family battles conditions of the Arctic to transport supplies to some of the least-accessible areas of Alaska.

Pilot Luke Hickerson transports dangerous chemicals to Atqasuk; Jim makes arrangements for the transportation of the first casualty of winter.

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

The crew races to finish Era's hangar before the winter snow arrives.

Pilot Yuri Ivanoff trains in Bethel; Jim tries to do a river landing in Unalakleet.

In a dangerous mission, pilot Doug Doherty flies along Russian airspace to transport volatile explosives to the island of St. Lawrence; Ben hits a large bird in midair.

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

The crew races to finish Era's hangar before the winter snow arrives.

Pilot Yuri Ivanoff trains in Bethel; Jim tries to do a river landing in Unalakleet.

In a dangerous mission, pilot Doug Doherty flies along Russian airspace to transport volatile explosives to the island of St. Lawrence; Ben hits a large bird in midair.

The zoo welcomes four Sumatran elephants; Robert and Terri try to guess the gender of Bindi's baby, but Bindi and Chandler have their own surprise in store.

Bindi and the zoo welcome two baby echidnas; health concerns become a major threat for one puggle's survival; a jabiru goes missing.

Cornish Rex kittens attempt to befriend an iguana; a tortoiseshell cat raises disparate twin boys; a Birman cat hopes her kittens will follow in her regal footsteps.

Calico kittens mingle with the patrons of a dog-grooming salon; shorthairs get into mischief; two tabbies frolic in the outdoors.

It's the start of hunting season, dubbed the holy day for game wardens; Wardens Inman and Eddins investigate the illegal shooting of two deer; Wardens Stapleton and McGee swap out bass in the Bois d'Arc Lake.

Game Warden Herchman saves an owl; Game Wardens Richards and McGee team up to work a case in an archery-only county; Game Wardens Benge and King investigate a poaching case.

Warden Marshall leads the charge on a poaching investigation; Warden Richards visits an allegedly illegal snake breeder; Wardens Gould and Hickerson try to save an injured pelican; Warden Miller brings a caracara bird to rehab.

On the Gulf, oyster boats and fish retailers are inspected; outside San Antonio, a poacher is caught after posting pictures; in East Texas, game wardens patrol deer camps and help a pelican in distress.

With oyster season in full swing, Texas Game Wardens ensure everyone is following the rules on land and water; hunters are investigated for trespassing on private property; game wardens find an oyster boat deckhand with several warrants.

Across Texas, Game Wardens enforce the law during prime deer season; bad weather conditions lead to a serious car wreck; a tipster reports an injured owl; a harassment issue between neighbors is addressed; illegal deer disposals are investigated.

Deer season is well underway across Texas; in East Texas, Game Wardens find a bobcat a new home and investigate an illegally killed deer; on the coast, the Texas Game Wardens deal with an outstanding warrant.

A hunter and a witness disagree about the truth; a trespassing target shooter; fishing for the truth from trespassing ATV riders.

Warden Parker goes on an exhaustive investigation involving local police, surveillance cameras and anonymous informants after the discovery of a dead beaver in a Skowhegan parking lot.

The wardens encounter people of all shapes and sizes who lie their butts off to get out of trouble; Warden Parker searches for a trigger-happy shooter in a populated neighborhood.

An unusual recreational vehicle in a high speed chase; combative speedsters; the scene of an ATV crash.

Officers interrogate a group about lighting fires in the woods; a sly fisherman with a bad habit; a lobsterman gets caught breaking the law.

Officer Hannett faces a test trying to capture an injured goose; Officer Lucas becomes the first responder on the scene of a drug overdose; Officer MacFadzen must climb 40 feet into the treetops to deal with an aggressive hawk.

Officers pursue a pair of intoxicated dirt bikers; an officer investigates a case involving an animal he's never dealt with; rescuing a baby bird.

Officers help state police investigate a missing persons case; a landowner needs help with a group of squatters; aiding an injured hawk.

An officer races to get a driver under the influence off the road; two teenagers joyride in an ATV; evacuating an injured hiker.

Officer Hannett faces a test trying to capture an injured goose; Officer Lucas becomes the first responder on the scene of a drug overdose; Officer MacFadzen must climb 40 feet into the treetops to deal with an aggressive hawk.

Officers pursue a pair of intoxicated dirt bikers; an officer investigates a case involving an animal he's never dealt with; rescuing a baby bird.

Officers help state police investigate a missing persons case; a landowner needs help with a group of squatters; aiding an injured hawk.

An officer races to get a driver under the influence off the road; two teenagers joyride in an ATV; evacuating an injured hiker.

Warden Parker goes on an exhaustive investigation involving local police, surveillance cameras and anonymous informants after the discovery of a dead beaver in a Skowhegan parking lot.

The wardens encounter people of all shapes and sizes who lie their butts off to get out of trouble; Warden Parker searches for a trigger-happy shooter in a populated neighborhood.

Ragdoll kittens romp with a German shepherd playmate; miniature Australian shepherds cozy up with ducklings.

Furry fun with three of the fuzziest, fluffiest and gosh darn cutest kittens in the world, Maine Coon, Persian and Siberian cats.

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.

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.

The time comes for Dr. Ross and Tauvia to move out of his mother's house; Dr. Lavigne makes a life-or-death decision with Diesel, a mastiff who may have a toy lodged in his intestines; Dr. Blue sees a pig with an affection for household furniture.

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.

A successful pet psychic is having trouble communicating with her vicious cat, Lily; Khloe the cat has developed erratic behavior after her owner discovered a colony of feral felines living behind the house.

A cat-obsessed woman gets a kitten as a gift, but is quickly disappointed when the cat terrorizes her other two felines; a couple living in harmony is disturbed by their newest addition's demonic ways.

When Debbie returns home from a trip, she finds her house covered and smelling like cat pee from her boyfriend, Brian's cat Blinkie, who denies the problem; Krisi may have to choose between marriage to her boyfriend Jason and her cat Frankie.

Former reality star Peggy Tanous is struggling to keep the peace between her cat Shadow and her family. Meanwhile, a couple is desperate for Jackson to change the frisky behavior of their feline, Albert.

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.

Two survivalists try to endure 21 days in the wreckage of an abandoned village in Botswana's Okavango Delta, where aggressive hippos have claimed the territory.

Shark attack fan survivalist teams up with an environmentalist military vet for a 21-day challenge in Zambia.

A wilderness EMT and a hard-headed homesteader try to survive in a coastal Colombian jungle; when their priorities clash, their partnership becomes volatile.

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

A wilderness EMT and a hard-headed homesteader try to survive in a coastal Colombian jungle; when their priorities clash, their partnership becomes volatile.

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.