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That's 800 million fewer than a previous estimate suggested.
New research bites into old Jurassic era T-rex population estimates
Dinosaurs Everywhere
Paleontologists find ancestor of T.Rex
Tyrannosaurus rex, Prehistoric Planet Wiki
Lifelike dinosaurs now among the creatures at Wildlife Safari Park
1.7 billion Tyrannosaurus rexes walked the Earth before going extinct, new study estimates
New T. rex's relative, a double-decker bus-sized dinosaur discovered
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
Newly discovered, primitive cousins of T. rex shed light on the end of the age of dinosaurs in Africa