Tyrannosaurus rex was the apex predator of the Cretaceous period, around 66 to 68 million years ago. But scientists had never calculated the total number of T. rexes there ever were—until now. A new study estimates that about 2.5 billion…
Tyrannosaurus rex was the apex predator of the Cretaceous period, around 66 to 68 million years ago. But scientists had never calculated the total number of T. rexes there ever were—until now. A new study estimates that about 2.5 billion…