2.5-Billion T-Rex Earth
Scientists believe that more Tyrannosaurus rex existed during the Cretaceous Period landscape than once thought. That’s right, they claim that up to 2.5 billion of them roamed the Earth during their estimated 2.4 million years and 127,000 generations inhabiting the western North America region. Many factors were considered, including geographic range, body mass, growth pattern, life expectancy, duration of a single generation and the total time this dinosaur existed before extinction 66 million years ago. Read more for two videos and additional information.

The scientists also used Damuth’s law linking population to body mass: the bigger the animal, the fewer the individuals. This put their analysis on the total number of T. rex individuals that ever existed at approximately 2.5 billion, including about 20,000 adults alive at any one time. The T.rex is currently one of the largest carnivorous dinosaurs, having a skull about 5-feet long, complete with large muscular jaws boasting a bite force capable of crushing bone.

LEGO Ideas 21320 Dinosaur Fossils Building Kit (910 Pieces)
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LEGO Ideas 21320 Dinosaur Fossils Building Kit (910 Pieces)
  • Role-play as a paleontologist and imagine what life on Earth was like millions of years ago as you build intricately detailed LEGO models of pterosaur...
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Why iconic? Heck, a hugely massive killer with super-huge teeth, one that you would never dream up on your own if we didn’t have the fossil record. So not only super-cool and beyond the imagination, but real. Like Godzilla, but actually real. And I think we like feeling small, and T. rex sure makes us feel small and vulnerable,” said paleontologist Charles Marshall, who led the study published in the journal Science.

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