From birth to adulthood, T. rex took 40 years growing into an eight-ton giant, and scientists think that long childhood helped it dominate the dinosaur world

New research reveals that Tyrannosaurus rex took 40 years to reach its massive adult size, challenging previous beliefs about ...
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T rex may have taken 40 years to become a giant

A new analysis of tyrannosaur fossils suggests Tyrannosaurus rex may have continued growing until around age 40. The finding ...
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T. rex took 40 years to reach full size, scientists find

For years, scientists believed Tyrannosaurus rex reached its adult size at around age 25. But a major new study suggests the iconic predator may have taken much longer to mature. According to the ...