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. 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. It “was the rhinoceros of its day, a grumpy herbivore that largely kept to itself,” Michael Greshko wrote in National Geographic in May, when the fossils were first revealed to the public.