T. rex grew for four decades before reaching full size, study finds
A new study of 17 tyrannosaur fossils using enhanced bone imaging and advanced statistics reconstructs Tyrannosaurus rex's growth, showing it continued maturing for about 40 years to reach roughly eight tons—longer than previously believed. The work also highlights potential misclassifications within the T. rex species complex (including Nanotyrannus) and introduces a composite growth curve that improves life-history understanding for dinosaurs.