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Researchers Have Estimated That Some 2.5 Billion T. Rex Lived And Died During The 2.5 Myrs That They Existed In The Cretaceous Period (65 –98 Myrs Ago). Scientists Estimated The Number Based On Fossil Record, Density Data And Data From Climate Models. They Also Deduced, For The First Time, That T. Rex Life Span Could Reach The Late 20s.

How many T. rex were there? Billions, it turns out – CNN

https://www.cnn.com/2021/04/15/world/t-rex-billions-intl-scli-scn/index.html

As many as 2.5 billion Tyrannosaurus rex roamed the Earth during their fascinating reign as top predators, according to a team of paleontologists from the University of California, Berkeley.