User blog comment:CreatorTheta/Human Evolution Theory in RWBY/@comment-6830001-20140624162537/@comment-3146930-20140624170805

That is true, RWBY is a fictional world in a fictional universe that follows its own set of fictional rules. No matter how much we try to explain things using the level of knowledge we have in our world, they don't use the same rules as us. In their world Aura comes from the soul, but currently we in our world have no proof that a soul even exists so we can't describe how it works. Going by logic, there is no way that the Faunus could ever be a real species, but within the context of the show it is ok and we don't have to question it.