skull
Raymond M. Alf Museum of Paleontology

On an expedition in 2009, teenager Kevin Terris, who had just graduated from high school, found a dinosaur bone. He wasn’t the only student on the expedition — it was part of a program, run by California’s Alf Museum, where paleontologists take students out to Utah’s Grand Staircase-Escalante National Monument, and see if they find anything. At first, Kevin’s find didn’t seem like much: a bit of dinosaur rib, a fairly common find. But then, upon further inspection, it turned out to be something much, much cooler, and much, much cuter.

It was a baby dinosaur, not more than a year old.

Baby dinosaurs are bigger than most humans, though. This one, who was nicknamed Joe, was six feet long, and it was a particularly amazing specimen of Parasuarolophus. This type of dinosaur grows a weird, long tube on its skull, and Joe had already starting growing his — he had a “low bump” on his head, says Science Daily.

In 2010, Joe’s bones were airlifted out of the archaeological site. It wasn’t until the professional fossil technicians got him back to the lab and started cleaning him up that they realized his head was still there. It took two years to clean him up. And now you can look inside his head.