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

Billions of Tyrannosaurus rex roamed North America during their fascinating reign as top predators, according to a team of researchers that went about the daunting task of making the calculation.

from CNN.com - RSS Channel - App International Edition https://www.cnn.com/2021/04/15/world/t-rex-billions-intl-scli-scn/index.html
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