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That's 800 million fewer than a previous estimate suggested.
How many 'Tyrannosaurus rex' walked the Earth?
1.7 billion Tyrannosaurus rexes walked the Earth before going extinct, new study estimates
Lifelike dinosaurs now among the creatures at Wildlife Safari Park
Nanotyrannus vs. T. rex saga continues: Controversial study 'doesn't settle the question at all
As many as 1.7 billion T-rexes once dominated the planet, finds new study - Interesting Engineering
Study: 2.5 billion T. rex roamed Earth, but not all at once
Dinosaur Census! Estimated 1.7 Billion T. Rexes Walked the Earth
How Big Was the T. Rex Population? Study Estimates That There Were 1.7 Billion of Them Lurking Over Earth Prior to Their Extinction
New research bites into old Jurassic era T-rex population estimates
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
Could a T. Rex really grow up to 46 feet in length? Why, or why not? - Quora
AMNH EXTINCT MONSTERS
Tyrannosaurus rex, Prehistoric Planet Wiki