Wiped off the face of the Earth by humans nearly a century ago, geneticists are now working on resurrecting the enigmatic Tasmanian Tiger.

The Tyrannosaurus Rex is known as the king of the dinosaurs, but how did its reign begin? Meet Moros Intrepidus, a 180 lb., deer-sized ancestor to the T-Rex. Learn how the latest in paleontology can now link this small dinosaur to the 19,000-pound Scotty, the largest T-Rex ever discovered.

New research reveals how incredible these ancient, unchanged reptiles really are - partly because of what’s called negligible senescence. This means that Alligators show almost no signs of aging -- regardless of how long they live - and that they are “biologically immortal.”

Capture teams from the U.S. National Park Service track down and relocate wolves to Isle Royale National Park in Lake Superior under an ambitious initiative to restore balance to a wilderness ecosystem.

Great white sharks are one of the most feared predators on Earth, and yet we know very little about them. Science is now revealing the mysteries of this perfect predator through evolutionary biology.

From the arctic tundra to the great planes, the kingdom of the wolf extends across the entire northern hemisphere. They are icons of the wilderness, spectacular creatures that live and die by the sword.

A cheetah raises her young family on the vast expanse of the Serengeti, facing enormous challenges. Lions are quick to throw their muscle around, and hyenas and jackals attempt to steal anything the cheetah manages to kill. The cubs will have to learn fast if they're going to survive.

The crocodile is the king of the wetland; a tone of a cold-blooded monster with the most terrifying bite force on Earth. The product of a 100 million year ancestry, the 25 species around today are a testament to the crocodile’s supreme intelligence and adaptability.

The endless plains of East Africa is a paradise for lions. The most social of all cats, lions form prides that are unlike any other animals. Together, they’ll hunt, raise their young and defend their territory. The pride welcomes new babies every year, but new children bring new dangers.

The ghost cat is one of the most elusive animals roaming the wilderness. Adaptable and resilient, these cats dictate a precarious cycle of life for the creatures who share their home. In the cold, inhospitable mountains above Chile, a single mother raises her three cubs.

T-rex -- the "tyrant lizard king" -- ruled the earth 65 million years ago. Today, he reigns as ultimate predator and pop cultural icon. His image is everywhere -- but few know how two scientific rebels probed the mystery of his sudden death, and uncovered the day that shaped the modern world.

There are many ways to defend yourself, you can run, fly, fight, but some animals have changed their entire body plans so they don't have to. Tortoises carry a fortress with them, armadillos can roll into a ball, sunfish have bulletproof thick skin, and echidnas are covered in spines.

Snakes are one of the most feared creatures on the planet and Asia is a hotspot for bites! But which is the deadliest? And should we be truly afraid?

If you go down to the woods today a wonderful treat awaits! Baby brown bears have a lot to learn about life in the forest, but thankfully all bears know their way around a good picnic. From the tundra of Alaska to the forests of Japan, brown bears can turn their paws to just about any environment.

Some see in them predatory beasts; others romanticize them as mythical creatures. The lives of wolves are defined by a strict hierarchy when they live in man-made reserves, but does it still exist when they live in the wild?

The Arctic is accessible to man only because of ice dogs. As hunters, haulers, and guardians, for thousands of years, they have been a vital link to nature. Dogs led the Sarqaq people out of Siberia and, a millennium later led explorers to the North Pole.

Didier Noirot dove with Jacques Cousteau over 5,000 times. Often, they were joined by South African photographer Roger Horrocks–notorious for his daring shark photography. This breakthrough documentary chronicles their dive with the giant Nile crocodile.

The jaguar is the third largest of the big cats, and pound for pound the most powerful. Our jaguar patrols a home range of over one hundred square kilometers in Brazil, deep in the heart of the world's largest tropical rainforest. But human interference means that his life only gets tougher.

The Lion, Africa’s ultimate predator. They’re known as the kings of the jungle yet their homeland is an open grassland rather than rainforest. In the African plains prey-rich real estate can be hard to come by, and lions work together to ensure no one claims their territory and usurps their crown.

Cats are cute but cunning, the secretive little predators we barely notice as they slink through the shadows. Though big cats may steal the limelight, the little ones have the highest hunting success rates and each kind has carved out its own techniques and niches.

Eco-activist Rod Coronado has made it his life’s mission to advocate for the planet and animal rights. In 2014, he formed Wolf Patrol, an activist group that fights to preserve the grey wolves which roam Wisconsin’s forests. This documentary follows his attempt to end wolf hunting in the U.S.

Uncover the mysteries of Planet Earth’s super predator: the Tyrannosaurus Rex. Combining the latest paleontological discoveries with cutting-edge CGI, the most scientifically accurate T. rex is born.

The ocean has its own Big Five. Featuring great whites, hammerheads, tigers, bulls, and the intimidating whale shark, this is the ultimate shark show.

Recent studies reveal that Tyrannosaurus Rex, once known as the king of all dinosaurs, was actually smaller and weaker. When T-Rex traveled from Asia to Eurasia, then into America, fierce competition to survive forced them to evolve into massive carnivores. Based on latest scientific insights.

Quite a few nature documentaries focus on predators, like lions and tigers. However, this one is different–portraying small, wild dogs that use cunning and adaptability to win their battles and achieve their goals.

To many, the wolverine is the stuff of movie superheroes, but they are some of the toughest, strongest, and most mysterious animals around. Following one wild family reveals a few of their closely guarded secrets.

When science and film team-up to explore the Einsteins of the oceans.

Go behind the scenes of wildlife filmmaking and join Andy Casagrande, as he gets up close and personal with some of the most iconic sharks.

In this unprecedented series, recent scientific discoveries shed new light on the extraordinary prehistory of big cats.

New discoveries of dinosaur fossils are completely changing what we know about the animals that lived on our planet millions of years ago.

Journey back to primeval Earth in the age of dinosaurs for new findings and puzzling discoveries about their evolution and extinction.

Dinosaurs! Dive into the lost world of the largest creatures ever to roam the Earth.

Wolves can cover over 600 miles when they migrate. Follow renowned wolf experts as they track three extraordinary wolves across Europe.