https://scitechdaily.com/paleontologists-stunning-conclusion-2-5-billion-t-rexes-roamed-north-america-over-the-cretaceous-period/
Analysis of what's known about the dinosaur leads to conclusion there were 2.5 billion over time. How many Tyrannosaurus rexes roamed North America during the Cretaceous period? That's a question Charles Marshall pestered his paleontologist colleagues with fo…
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