FILE PHOTO: Geologist Bill Simpson uses a feather duster to clean the Tyrannosaurus rex fossil known as "Sue" at the Field Museum in Chicago, Illinois, United States, June 11, 2015. REUTERS/Jim Young/File Photo
WASHINGTON (Reuters) - Large meat-eating dinosaurs attained their great size through very different growth strategies, with some taking a slow and steady path and others experiencing an adolescent growth spurt, according to scientists who analyzed slices of fossilized bones.
The researchers examined the annual growth rings - akin to those in tree trunks - in bones from 11 species of theropods, a broad group spanning all the big carnivorous dinosaurs including Tyrannosaurus rex and even birds. The study provides insight into the lives of some of the most fearsome predators ever to walk the Earth.
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