Rarity of fossils of young tyrannosaurs explained | Science News



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Rarity of fossils of young tyrannosaurs explained

11:57am, July 25, 2006

Paleontologists have unearthed only a few juvenile tyrannosaurs, and a new analysis suggests why: Unlike many other creatures both modern and ancient, a large percentage of those meat-eating dinosaurs survived into adulthood.

Many dinosaur bones, including those of Tyrannosaurus rex and its relatives, show growth rings, just as trees do, says Gregory M. Erickson, a paleobiologist at Florida State University in Tallahassee. Now, he and his colleagues have counted growth rings in leg bones to determine the age distributions of four tyrannosaur species.

The 22 specimens of Albertosaurus unearthed at a quarry in A

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