A while back, Ben Miller reminded me that when I posted about the old Yale “ Brontosaurus ” skull, I promised: So how did the YPM come to make such a monstrosity? What was it based on? Tune in next time for the surprising details! I told him at the time that I’d soon get around to writing a post. But before I did, he wrote a post on this himself: Bully for Camarasaurus . And it’s excellent.