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 firstvertebra joint was a perfect socket and ball joint The base of the skull has a perfect hemispherical socket for the firstvertebra 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