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That's 800 million fewer than a previous estimate suggested.
Largest prehistoric animals - Wikipedia
Tyrannosaurus rex, Prehistoric Planet Wiki
Tyrannosaurus rex, Prehistoric Planet Wiki
Allosaurus - Wikipedia
How large would a T. rex be if a person's height barely reached its ankle? - Quora
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion
Scientists have discovered how many T-Rex ever existed
Fewer T. rex walked the Earth than previous estimated, new study claims
I Don't Believe in Dinosaurs. Read my 4 points and tell me if it's my…, by J & J (Jessica & Joshua J. Lyon, BSQP, CNP)
Dinosaur Census! Estimated 1.7 Billion T. Rexes Walked the Earth
How many 'Tyrannosaurus rex' walked the Earth?
Tyrannosaurus rex, Prehistoric Planet Wiki