240-million-year-old fossils indicate how dinosaurs grew from hatchlings to adults

Paleontologists have found that muscle-scarred fossil leg bones of one of the closest cousins of dinosaurs that lived approximately 240 million years ago can shine new light on a large unknown: How early dinosaurs grew from hatchlings to adults. The findings are surprising: dinosaurs and their close relatives had much more variation in growth patterns then ever expected, and this variation does not appear to be related to differences between males and females.
Paleontology News — ScienceDaily

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