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That's 800 million fewer than a previous estimate suggested.
Newly discovered, primitive cousins of T. rex shed light on the end of the age of dinosaurs in Africa
How big was a T-rex in relative size compared to other animals such as an elephant, hippopotamus, rhinoceros, etc.? - Quora
Allosaurus vs T-Rex: Who Would Win the Battle? - Gage Beasley Prehistoric
Albertosaurus - Safari Ltd®
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
How many T. rexes ever lived? If you think a billion, go higher
Dinosaurs in Alphabetical order. Starting with letters T
Are scientists trying to bring back the T-Rex? - Quora
Tyrannosaurus rex, Prehistoric Planet Wiki
How Big Was the T. Rex Population? Study Estimates That There Were 1.7 Billion of Them Lurking Over Earth Prior to Their Extinction
Dinosaur world presentation