My knowledge of the Buffyverse is a little rusty these days, having been away from it for so long, but this is something that used to occur to me fairly often. According to the mythology, demons inhabited Earth aeons before the rise of humanity, right? We've occasionally seen some of these ancient, pureblood demons, or "Old Ones", on BtVS and AtS, and they often bear some resemblance to dinosaurs, e.g. gigantic, reptillian beasts. I do recall a line in the BtVS episode "Graduation Day, Part 2" where a character researching the pureblood demon the Mayor aims to transform into reads from a scientist's journal; the scientist had discovered the demon's remains and thought it might be some new kind of dinosaur, at which another character responds "A demon?" I have heard that in the AtS comic book series published by IDW (which is considered a canonical continuation of the TV show), the gang run into a demon who looks like a T-Rex. Here we have a few instances where characters make connections between demons and dinosaurs. Personally, I'd hate it if they made out that dinosaurs were demons; I don't know, it just seems simply too ludicrous to even contemplate. What do other people reckon?