Tyrannosaurus rex Took Nearly Four Decades to Grow Up, New Research Shows

Jan 15, 2026 - 18:00
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Tyrannosaurus rex Took Nearly Four Decades to Grow Up, New Research Shows
Tyrannosaurus rex holotype specimen at the Carnegie Museum of Natural History, Pittsburgh, the United States. Image credit: Scott Robert Anselmo / CC BY-SA 3.0.

A comprehensive analysis of 17 fossil specimens reveals that Tyrannosaurus rex grew far more slowly than previously thought -- reaching its full-grown size of eight tons around age 40 -- and challenges earlier assumptions about its life history.

The post Tyrannosaurus rex Took Nearly Four Decades to Grow Up, New Research Shows appeared first on Sci.News: Breaking Science News.

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