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How many _Tyrannosaurus rex_ walked the Earth?

  • Written by Ashley Poust, Research Associate in Paleontology, University of California, Berkeley
How many _Tyrannosaurus rex_ walked the Earth?_Tyrannosaurus rex_ spanned all of ancient North America, and about 20,000 lived at once.1Ado123/Wikimedia Commons, CC BY-SA

The Research Brief is a short take about interesting academic work.

The big idea

During 2.4 million years of existence on Earth, a total of 2.5 billion Tyrannosaurus rex ever lived, and 20,000 individual animals would have been...

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