Study rewrites T. rex growth: four-decade path to full size
A broad analysis of 17 Tyrannosaurus rex specimens indicates the species continued growing for about 40 years, reaching roughly eight tons, with growth rings detected via new imaging methods and a composite growth curve that stitches data from multiple individuals. The findings suggest a longer life history than previously thought and raise questions about whether some well-known fossils belong to related species such as Nanotyrannus.