History's Wildest Beasts

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

This series sheds light on the kind of life that existed in the Permian, Triassic and Cretaceous periods beginning 250 million years ago.

Circle the globe on this exhilarating 5-part epic that “connects the dots" between the GIANTS of the natural world, past and present.

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.

Modern birds are the most direct descendants of some of the most iconic dinosaurs to ever walk this planet. But can science really enable us to alter chicken embryos to resemble their mightiest ancestor: T-Rex?

Ancient Yellowstone returns for a second season to continue its scientific exploration of the area and its ancient inhabitants.

How long does it take for life to rebound after a major mass extinction? Scientists in Svalbard dig through fossil clues for surprising revelations about our Earth's history.

A lost prehistoric world of Antarctica is brought back to life through state-of-the art CGI.

It’s the dry season near the Serengeti and hungry lions threaten the livelihood of cattle-herder Rugari and his family. He could kill the predatory lions and protect his cattle, but his daughter seeks another solution. Filmed on location in Tanzania—where the worlds of lions and humans collide.

Could a 75 million-year-old dinosaur skull that has been sitting in a museum for over 20 years hold the first-ever dinosaur DNA discovered by humans? Follow an international team of scientists as they try to unlock the mystery of dinosaur DNA sequences.

An extraordinary new discovery of a dinosaur fossil so pristine and complete, that it shows off the texture, patterns, and color of a prehistoric giant. Discover this brand new species that roamed during the late Jurassic and Cretaceous periods.

This remarkable series celebrates the biological and geographic diversity of one of the world's most unique countries: New Zealand.

For thousands—or even millions—of years, they ruled the food chain. And they still fascinate us. Creatures synonymous with the hunt: Saber Teeth, Mega Jaws, even a Tyrant King. How did they win evolution’s race—and what brought their reign to an end?

Lions may be known as the kings of the jungle, but it was saber-tooth cats that ruled over the Americas. New fossil evidence is shinning a light on the violent lives of these mysterious species.

Big cat populations are shrinking fast, but now we have the means to view them in more detail than ever.

The Cuban crocodile is an endangered species poised to disappear. Meet the people trying to save this unique animal from extinction.

Deep within the Javan jungle, an expedition has set out in search of the last stand of the world’s rarest rhino. Once prolific across Asia, the Javan Rhino now exists only in Java, where photographer Toby Nowlan is on a mission to photograph the species in hopes of protecting it from extinction.

For thousands of years, big cats were revered as gods and symbols of power. Today, habitat loss and cultural distance threaten their survival, pushing humanity's ancient bond with these predators to a breaking point.

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.