National Geographic Wild HD

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik to find a dangerous predator lurking just outside of camp.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Alaskans struggle to get through the everyday grind as a long, dark winter looms ahead.

The looming winter forces Alaskans to tackle obstacles to ensure a prosperous winter.

Alaskans must travel far and wide to obtain resources vital for survival in the dead of winter.

Alaskans trap and hunt for essential food and fur to survive the dark winter.

In anticipation of the coming spring, Alaskans pursue scarce resources.

As winter winds down, Alaskans encounter roadblocks in their struggle for survival.

From volcanic origins, Katmai's lush expanse boasts more than just bears.

An ecological treasure of North America, the Everglades brims with life.

An American trailblazer, Yellowstone is renowned for its natural wonders.

From glacial peaks to coastal rainforests, Olympic has rich biodiversity.

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Socks the dog has a mysterious fever sending Dr. Lauren to search for clues.

Dr. Lauren investigates a pit bull experiencing rapid muscle loss.

Dr. Lauren's former patient, Dasha, returns with alarming seizures.

Dr. Lauren tries to help a cat with nonstop infections and incontinence.

Dr. Lauren races to save a French bulldog with a mysterious bowl issue.

Dr. Oakley ends up in the middle of a brawl between two brother bears while visiting a bear sanctuary.

Dr. Oakley risks her life to save a drowning brown bear.

Routine calf castration surgery turns dangerous.

Dr. Oakley travels to Prince Edward to deal with the inbreeding problem among American bison.

Dr. Oakley chases some of the Yukon's toughest wild horses.

Dr. Oakley examines two feisty wood bison before releasing them into the wild.

Dr. Oakley performs examinations on two black bears during a dangerous relocation.

Dr. Oakley runs after sheep and reunites with a dog that has developed a puzzling paw problem.

Hazen Audel lives among some of the world's fiercest and most isolated tribes as he finds out how they survive some of the most hostile conditions on Earth.

Hazen Audel joins the Waorani Tribe in the Ecuadorian Amazon, where he must learn to live off nothing more than the invaluable tools found in nature.

Hazen Audel is put to the test by Mongolian Kazakhs as he attempts to survive frigid temperatures and hunt with golden eagles.

Joining elite fishermen in the Solomon Islands, Hazen Audel must determine whether he is brave enough and skilled enough to haul in a shark from a dugout canoe.

Hazen Audel endures a crash course with the San people of Namibia in the hopes of joining an elite four-man team on an epic Kalahari hunt.

Hazen tries to master the skills that have allowed the Inuit to survive in Arctic Canada as he chisels through three feet of ice and learns to build an igloo; then, he must go into ice chambers below the sea to harvest mussels.

How the giant megalodon shark took over the oceans.

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Puppies, a peahen and a miniature horse all get the Dr. Pol treatment.

The vets work their magic on baby beagles, weeping wounds and broken bones.

From emergency calvings to shaky emus and goats, Doc comes to the rescue.

Dr. Pol helps 4-H kids get their farm animals ready at the County Fair.

PVS springs into action to treat everything from checkups to emergencies.

Dr. Pol races to save a cow battling tremors and assists a difficult birth.

Bones, throats, navels, tendons and toes need fixing by PVS.

PVS is busy, from birthing mega pups to welcoming a new Pol bundle of joy.

From fights and falls to geckos and goats, Doc and the vets save the day; pigs, puppies and an adorable vet-to-be keep things interesting at the clinic.

It's a real dog and pony show at PVS; the docs glove up and giddy up.

The PVS team tackles cases from a mangled mutt to a severely bloated steer.

Two of Taronga Zoo's gorillas will be anesthetized for their checkups.

A historic moment for Taronga as lioness Maya gives birth; Jilly the tammar wallaby delivers her second joey.

A celebration of the unsung heroes of Taronga Zoo, insects.

Pairing endangered parrots for breeding is more complicated than it seems.

Vets race to nurse a malnourished platypus back to health.

Keepers show off Taronga's terrific turtles.

A bulldog fights for every breath as Dr. Lauren searches for a solution.

Dr. Lauren tries to help a cat with nonstop infections and incontinence.

Dr. Lauren investigates a pit bull experiencing rapid muscle loss.

Archaeologists explore hidden tombs and find spectacular mummies.

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Curious happenings abound at the clinic.

After 40 years in business with five vets in rotation, Pol Veterinary Services is a well-oiled machine; when three vets have the day off, it is up to the veteran vets to take the helm.

There is no time to waste when a playful pup breaks its leg; a duck comes down with diarrhea; and a chihuahua starts honking like a goose.

Dr. Pol and Dr. Lisa are a dynamic duo when similar cases arrive at PVS.

A never-ending parade of PVS patients.

From lumps and bumps to geckos and goats, Dr. Pol and the vets save the day.

It's the dog days of winter for PVS as they treat limps, lumps and injured pups.

Puppies have overrun the clinic; six litters of playful pups need checkups.

The vets treat back-to-back canine emergencies and aid a farrowing pig.

The PVS vets treat a herniated horse, a mischievous mouse, and a kangaroo.

Keepers hope for a long-awaited sand cat kitten; a nervous puffin learns to swim.

Zoo vets treat pythons that need urgent medical care and otters go to fish school.

The vets are swamped as a gator needs blood drawn, and a lion requires a tooth extraction.

Meet some of the adorable youngsters that grow up in the iconic Australian bush.

After weeks of training, keepers prepare an elephant for x-ray imaging.

Vets rehab an injured barn owl; keepers welcome a new tree roo.

Dr. Lauren races to save a French bulldog with a mysterious bowl issue.

Dr. Lauren's former patient, Dasha, returns with alarming seizures.