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.

Photographer Martin Dohrn has rigged special cameras in order to capture the hectic and complex world of Bristol -- in his backyard! Watch as he slows down the almost imperceptible movements of the insects that populate his garden from fascinating bee species to active spiders and more.

Join astronaut Chris Hadfield - a YouTube sensation for his performance of David Bowie’s “Space Oddity” aboard the International Space Station - along with hitchhikers Michio Kaku (and others) on a joyride across our Solar System, scaled down to the size of the continental United States.

The Apollo equipment has sat abandoned on the lunar surface for over 40 years. Now there is a renewed excitement and drive to return to the moon. This time, not to just plant a flag, but to colonize. How would we accomplish this? And why would we do it?

Bugs, they're everywhere. Get an up close and personal look at the many unique secrets that can be found in the insect world. These creepy crawlies never looked so big!

Domestication shaped wolves into dogs and transformed both their behavior and their anatomy. New discoveries show how dogs produce a very specific eyebrow movement more often than wolves do. But how and why did “puppy dog eyes” develop in domesticated dogs?

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 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.

Few things are more wondrous than the gift of flight, but some birds have chosen to give it up – the question is, why? Whether it is to save energy, tap into new food resources, or invest in other skills, they all have their reasons.

In their vast and unforgiving home of the Namib desert, meerkats rely on their companions to watch their backs. Only together can they find the strength and resources to defeat the odds stacked against them. One young female is forced from her group after a brutal attack.

Monkeys are some of the most evolutionarily successful species on the planet, from Japanese snow monkeys to African baboons. Loveable, aggressive, and full of mischief, our distant cousins have much in common with us. Swinging through our primate family tree quickly reveals the diversity.

Few countries have a more iconic representative in the animal kingdom than Australia and the marsupial. Marsupials are a weird and wonderful mob of animals who carry their young in a pouch. Whether hopping, climbing, or airborne, marsupials are some of the most fascinating creatures.

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 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 North Atlantic Right Whale is on the verge of extinction. The leading cause of death and injury to the whales is from ship strikes or entanglement in fishing lines. In this Breakthrough episode, we will hear from the leading experts and biologists who are racing to save this species.

Throw on your wetsuit, and join filmmakers Kyle McBurnie and Alex Warham as they show off their California wild backyard, deep in the Pacific Ocean. See the wildlife that, while not always visible, calls this place their home.

More beautiful than butterflies, more spectacular fliers than hummingbirds, and with intriguing behavior as complex as mammals or birds. They’ve been flying around for hundreds of millions of years, crossing paths with dinosaurs before we mammals were even a twinkle in the eye of evolution.

Whales have long been a profound mystery to us. They live in a world so removed from our own that we can barely imagine their lives. Their environment is different, their senses are different, their relationships are different. How might such almost alien creatures see the world?

Every day in nature, hidden miracles are occurring. Plants are communicating, helping each other thrive. Staying aware of their surroundings by using dozens of highly sensitive sensors, plants are sending signals, even across species. Cutting-edge science is revealing surprising abilities of plants.

Can you believe your eyes? You may have 20/20 vision, but as Prof. Shapiro shows you may not be seeing what is "really" there.

The US National Parks have some of the most iconic landscapes in the U.S. But there is also an underwater side to explore!

Wildlife expert and photographer, Casey Anderson, introduces us to some amazing wildlife in Yellowstone!

They’re out there, all alone in the vastness of space. Join the space probes, and their parents back on Earth, to explore our solar system.

Nature follows a number of intricate and subtle mathematical rules to produce the patterns, shapes, and colors that we find so mesmerizing.

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

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

Professor Art Shapiro reveals the secrets behind another collection of mind boggling visual illusions.

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

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

The ultimate guide to invertebrates, with key biological themes to show a wide range of species.

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