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That's 800 million fewer than a previous estimate suggested.
Study: 2.5 billion T. rex roamed Earth, but not all at once
Scientists model population numbers of T-rex, suggest they were social animals
Billions of T. rex likely roamed the Earth, paleontologists report
How Many Tyrannosaurus Rexes Ever Lived on Earth? Here's a New Clue. - The New York Times
Giganotosaurus vs T. rex, who is the deadliest predator? - Quora
Fewer T. rex walked the Earth than previous estimated, new study claims
Tyrannosaurus rex
How many 'Tyrannosaurus rex' walked the Earth?
Almost 2 Billion T. Rexes Once Stomped the Earth
Was the tyrannosaurus rex the largest predator of its time? If not, what was the largest predator of its time and how big was it? - Quora
Tyrannosaurus rex, Prehistoric Planet Wiki