Around 2.5 billion Tyrannosaurus rex ever walked the Earth

Estimates suggest that 20,000 adult T. rex existed at any one time

ROGER HARRIS/Science Photo Libra

A total of 2.5 billion Tyrannosaurus rex probably existed during the lifespan of the species, researchers have calculated – suggesting that very few survived as fossils.

Charles Marshall at the University of California, Berkeley, and his colleagues used body mass and population density to estimate how many T. rex once lived.

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