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: Scientists originally thought T. rex matured in 20 years, but new bone analysis indicates they were slow growers, not reaching full size until 35 to 40 years old.
: New research suggests T. rex walked on its tiptoes, a bird-like foot function that made it an efficient walker rather than a high-speed runner. : Scientists originally thought T
: Adults could reach lengths of 40–42 feet and weigh up to 8–9 tons. : Scientists originally thought T