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That's 800 million fewer than a previous estimate suggested.
What is the evidence for and against the claim that T-Rexes were scavengers? - Quora
Were there T-rexes during the Jurassic period? - Quora
New study says 1.7 billion T-Rexes roamed the earth before going extinct
Paleontologists reveal 'the most dangerous place in the history of planet Earth'. 100 million years ago, ferocious predators, including flying reptiles and crocodile-like hunters, made the Sahara the most dangerous place on
Tyrannosaurus rex, Prehistoric Planet Wiki
Largest prehistoric animals - Wikipedia
The Stegosaurus Was An Ancient Relic To The T. Rex, Nature and Wildlife
Dino-Killing Asteroid Hit Just the Right Spot to Trigger Extinction
New T. rex's relative, a double-decker bus-sized dinosaur discovered