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That's 800 million fewer than a previous estimate suggested.
What would happen if a T-Rex was born today? - Quora
Allosaurus - Wikipedia
How Many Tyrannosaurus Rexes Ever Lived on Earth? Here's a New Clue. - The New York Times
Why was the T.rex so much bigger than other tyrannosaurs like Tarbosaurus and Daspletosaurus? - Quora
Science news this week: Deadliest spiders, mysterious noises in space and 1.7 billion T. rexes
How many T. rex were there? Billions, it turns out
Tyrannosaurus rex, Prehistoric Planet Wiki
Was the tyrannosaurus rex the largest predator of its time? If not, what was the largest predator of its time and how big was it? - Quora
Meet Rexy's Big, Bad Tyrannosaur Cousin, Tyrannosaurus mcraeensi
Insufficient Evidence To Support Trio Of T. Rex Species Theory, Say Scientists
Fewer T. rex walked the Earth than previous estimated, new study, rex
Dinosaurs: Why did 'T. rex' have such tiny arms?, Science, rex
Nanotyrannus vs. T. rex saga continues: Controversial study 'doesn't settle the question at all
Fewer T. rex walked the Earth than previous estimated, new study, rex
The Total Number Of T-Rex That Ever Walked The Earth Is 2.5 Billion