They’re huge, powerful…and full of surprises.

A pregnant Tuarangisaurus is in distress—and her young calf can sense it—as she travels waters that are home to the ocean's deadliest predators.

Why would a flying reptile have a large and cumbersome, yet remarkable, head crest? Learn this and more about Pterosaurs in Prehistoric Planet.

Above the deserts of North Africa, aerial combat ensues as male Barbaridactylus pterosaurs fight for the attention of females below.

“It would’ve looked a lot more like a really terrifying turkey.” Millions of years later, dinosaurs are still full of surprises.

With its feathered body and duck bill, the eight-ton Deinocheirus wades through an Asian wetland in search of relief from pesky biting flies.

“There is scientific evidence for deadly dinosaurs joining forces.”

Within the snow-covered forest, a tense standoff develops between ancient rivals, Pachyrhinosaurus and Nanuqsaurus.

A tiny pair of limbs with a big role to play.

A journey through an underground cave in North America turns perilous when a young Triceratops is separated from its mother.

On a small island, a monumental display takes place as the giant Hatzegopteryx reveals his gentler side to woo a mate.

Trudging through a scorching desert, two young Tarchia find relief at an oasis and encounter an adult twice their size, ready to lay claim.

In a drought-stricken basin where much has perished, an old Pachycephalosaurus bull defends his leadership against a young challenger.

Deep beneath the water's surface, the world's largest predator—the Mosasaurus—lies in wait to ambush unsuspecting prey.

Not many can intimidate North America's top predator, T. rex, whose size and bite are a deadly combo—except for a giant winged foe.