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That's 800 million fewer than a previous estimate suggested.
Unraveling the Feathered Mystery: Did T-Rex Have Feathers? - Gage Beasley Prehistoric
Jurassic World Explorers: WORLD'S BIGGEST T-REX!
The Maximum Number Of T. Rex To Ever Walk The Earth Was 1.7 Billion, rex
The World of Dinosaurs
How Many Tyrannosaurus Rex Walked the Earth?
Are scientists trying to bring back the T-Rex? - Quora
Fewer T. rex walked the Earth than previous estimated, new study claims
How Many Tyrannosaurus Rexes Ever Lived on Earth? Here's a New Clue. - The New York Times
New study says 1.7 billion T-Rexes roamed the earth before going extinct
