A titanic track found at a remote Alaska national monument is the first evidence that Tyrannosaurus rex once roamed there, park rangers say.

“RAWR!” rangers at Katmai National Park, which also oversees Aniakchak National Monument, wrote on Twitter with a photo of the footprint.

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“If you had seen this, would you have recognized it as a track?” rangers wrote. Researchers knew that dinosaurs once lived in what is now Alaska, but the footprint provides the first evidence that T. rex was among them.

Read more: The Sacramento Bee