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'Navajo warrior' dinosaur was a real fighter, with a scar to prove it

Scientists have unearthed fossils of a fearsome feathered dinosaur in northwestern New Mexico that was a quick and agile predator that could chase down smaller prey or swarm larger prey in pack attacks 67 million years ago. And, judging from a telltale scar on one of its menacing sickle-shaped claws, this Cretaceous Period dinosaur also fought with others of its own species.