Scientists have discovered the first definite horned dinosaur species in North America, and it's all thanks to a skull they found in Montana.
Andrew Farke and his colleagues at the Raymond Alf Museum of Paleontology describe their findings in a newly published study in the journal PLOS ONE. The species, Aquilops americanus, is an important discovery because the next horned dinosaur species from North America didn't live for roughly another 20 million years.
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