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.
Deep beneath the water's surface, the world's largest predator—the Mosasaurus—lies in wait to ambush unsuspecting prey.
In a drought-stricken basin where much has perished, an old Pachycephalosaurus bull defends his leadership against a young challenger.