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Paleontologists from the American Museum of Natural History and the Field Museum of Natural History made the discovery while examining fossils of a forearm bone that was dug up in Mongolia in 1998.
"The lack of quill knobs does not necessarily mean that a dinosaur did not have feathers," said lead author of the study Alan Turner.
"Finding quill knobs on the velociraptor, though, means that it definitely had feathers. This is something we'd long suspected, but no one had been able to prove."