triceratops i love the triceratop dinosaurs i am often disappointed that most museums display their skulls with the back to the wall this makes it impossible to see that the skull to first vertebra joint was a perfect socket and ball joint the base of the skull has a perfect hemispherical socket for the first vertebra to sit in i spent decades looking at them before i saw the back of one all that time i assumed but did not know that they would be able to quickly turn their heads one glance and it is obvious that my assumption was correct