How many 'Tyrannosaurus rex' walked the Earth?

Using the incredible wealth of fossil data and a modern ecological theory, researchers estimated population density for the extinct apex predator.

New research paper theorizes that Tyrannosaurus rex was built for slow walking

The Total Number Of T-Rex That Ever Walked The Earth Is 2.5 Billion

Latest Research Shows That Around 2.5 Billion T. Rexes Once Roamed The Earth

Dinosaurs' walk the Earth in Anaheim – Orange County Register

Tyrannosaurus - Wikipedia

New Study Says T. rex Might've Been 70% Larger Than Existing Fossils Suggest

Fewer T. rex walked the Earth than previous estimated, new study, rex

How Many Tyrannosaurus Rexes Ever Lived on Earth? Here's a New Clue. - The New York Times

T. rex's older and equally sizable relative discovered in New Mexico - East Idaho News

Paleontologists Stunning Conclusion: 2.5 Billion T. Rexes Roamed North America Over the Cretaceous Period

Tyrannosaurs may have hunted together in packs like wolves

Walking with Dinosaurs: Tyrannosaurus rex by TrefRex on DeviantArt

Billions of T. rex likely roamed the Earth, paleontologists report

Fewer T. rex walked the Earth than previous estimated, new study, rex