Ah,
Well I would go back to the fabled Era that came before the Prehistoric! The land of the Gods.
Believe it or not; most people don't actually seem to ever put together that Humans have long existed alongside Animals since before even the first Dinosaur set foot on the Planet. Nobody ever understands that everything in their DNA is always present in the Parents; and there's no reason that their Great Great Great Great Grandparents wouldn't have thought identical to them.
Then comes all the hullabaloo about Plagues, lack of Hygiene, being a Knight at 12, all kinds of hogwash. Simple DNA my friend, remember that. There's no reason if you don't like going to the bathroom in a bucket filled with other's "contents" from a Week's worth, that your Grandfathers wouldn't have hated it too. Plus its hysterical that people don't see that a type of "London Plague" environment filled with all sorts of Bodily filth on the roadsides, is going to pollute the Planet worse than 1,000,000,000 cars driving around every day needlessly. And if it had even happened for around a year, by 9,999BC we would have no more Earth.
But yes, virtually everything is Real and Possible, we just don't know how it all works yet. The Muggles anyway. ;P