text:  and have concealed themselves from the rest of us, which isn't all that radical, as anyone who has watched Ancient Aliens knows. But then they move into the strange territory. They suggest parallel evolution, in which another sentient species developed on Earth, but remained hidden for, well, millennia. They're back to an intelligent descendant of the dinosaurs, and I kind of explored this idea in a science fiction novel, a horror novel I did, called Vampire.