YOU GUYS. Why didn't anyone tell me about this? First they try to say that it's not a Brontosaurus, it's an Apatosaurus. NOW I find out that Triceratops are just juvenile Torosaurs?! Who do you think you are, paleontologists, mucking up my childhood… George Lucas?

Anyway, the scoop comes from rock-star paleontologist Jack Horner and another guy named John Scannella. Here's what they have to say for themselves:

As the animal aged, its horns changed shape and orientation and its frill became longer, thinner and less jagged. Finally it became fenestrated, producing the classic torosaurus form…

This extreme shape-shifting was possible because the bone tissue in the frill and horns stayed immature, spongy and riddled with blood vessels, never fully hardening into solid bone as happens in most animals during early adulthood.

Whatever.