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That's 800 million fewer than a previous estimate suggested.
Here's how scientists calculated how many T. Rexes lived on Earth
National geographic - T Rex (Tyrannosaurus Rex) - New Documentary HD 2018
Montana T. rex to arrive at Smithsonian in April
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, t rex
Unraveling the Feathered Mystery: Did T-Rex Have Feathers? - Gage Beasley Prehistoric
Tyrannosaurids Classification & Types
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, t rex
Scientists Discover Pregnant T. Rex Fossil
Nanotyrannus vs. T. rex saga continues: Controversial study 'doesn't settle the question at all