Pachyrhinosaurus

Ah, a Pachyrhinosaurus!

I’ve been told that these dinosaurs are quite bossy! Instead of a nasal horn, Pachyrhinosaurus sports an overgrown mass of bone called a “nasal boss” above its eyes and nose. It certainly lives up to its name, the “thick-nosed lizard!”

There are three species contained within the genus Pachyrhinosaurus, each with their own unique facial characteristics. While we don't know the primary purpose of these features, we can assume that the differences help an individual recognize members of its own species - and help males impress the ladies.

My, that head looks heavy. Thankfully, the frill extending off the back of its heads is hiding a secret: There are two large holes punched straight through the bone to relieve the weight of all those adornments. The holes aren't visible during life, as you can see, they're beneath all that skin and keratin.