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That's 800 million fewer than a previous estimate suggested.
Tyrannosaurus rex, Prehistoric Planet Wiki
Allosaurus vs T-Rex: Who Would Win the Battle? - Gage Beasley Prehistoric
How many 'Tyrannosaurus rex' walked the Earth?
Dinosaurs May Be Extinct, but They Look Extremely Lifelike in Rehovot - Haaretz Com
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
Rex ARK: Survival Evolved
Allosaurus vs T-Rex: Who Would Win the Battle? - Gage Beasley Prehistoric
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
How Big Was the T. Rex Population? Study Estimates That There Were 1.7 Billion of Them Lurking Over Earth Prior to Their Extinction
Are scientists trying to bring back the T-Rex? - Quora
Allosaurus - Wikipedia
