And so can some fish, at least where I'm from. But they've evolved differently, because of the influence of the oil. Changed by the outside influence.

[Star Wars has some weird fish.]

I wouldn't be disinclined at all. The Dark and the Light both have their own will. The Light often guides people towards answers, and sometimes offers visions to point people in a direction. When it exerts it's will, an adept will experience a moment of clarity. As for the Dark, it brings out violent urges, accompanied by rage. It too offers visions of the future, but often warped, and they aren't quite as accurate as the Light Side's.