Two-and-a-half billion T-Rex have roamed the earth

Embargoed until: Publicly released: 2021-04-16 04:00

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Fresh work sheds light on the absolute numbers and preservation rate of Tyrannosaurus rex dinosaurs. Researchers estimate that at any one time, about 20,000 individual dinosaurs were present in the world, the species continued for about 127,000 generations, and the total number that ever lived was about 2.5 billion individuals. Though some uncertainty remains, the authors say today’s capacity for inferring population sizes of extinct species far exceeds earlier work from the past 75 years.