Total T. Rex Population During Species' Existence Was 2.5 Billion
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Study: 2.5 billion T. rex roamed Earth, but not all at once
How many T. rex ever existed? Calculation of dinosaur's abundance
Paleontologists Believe 2.5 Billion T. rex Roamed the Earth Over
Billions of T. rex dinosaurs existed on Earth, scientists reveal
How Many T-Rexes Once Roamed the Earth? Maybe Billions
In All of Time, 2.5 Billion Tyrannosaurus Rexes Have Roamed Earth
How many T. rexes ever lived? If you think a billion, go higher
The phylogeny and evolutionary history of tyrannosauroid dinosaurs
Like Godzilla, but actually real': Study shows T. rex numbered 2.5
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