Science
A whopping 2.5 billion fully grown T. rexes walked the Earth in the course of the species’ existence, paleontologists found – Business Insider Australia
A study estimates how many adult T. rexes could live in a given area. That enabled researchers to calculate the total number of rexes that ever lived.

An adult Tyrannosaurus rex required a lot of space – and the prey therein – to survive.
According to new calculations from paleontologists the University of California, Berkeley, each adult T. rex lived in an area roughly 40 square miles in size.
The study, published Thursday in the journal Science, uses that math to offer an estimate of the total number of these predators that walked the Earth during the Cretaceous Period, between 66 and 68 million years ago: an impressive 2.5 billion.
“The total…
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