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In 2011, a Canadian miner accidentally stumbled upon an eerily well-preserved, 18-foot-long dinosaur covered in spikes, and scientists now believe the 110-million-year-old fossil belongs to a brand-new species. The 2,800-pound dinosaur is in near-perfect 3D, from its nose to the tips of its (many) horns. Its petrified remains give scientists an unprecedented view of what this prickly dinosaur looked like, which could tell us a lot about the world it lived in.

Despite its dragon-like appearance, this dinosaur wasn’t a fearsome predator, but a well-defended, solitary vegetarian in the nodosaur family, a close cousin of the club-tailed ankylosaurids. It “was the rhinoceros of its day, a grumpy herbivore that largely kept to itself,” Michael…

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