I have citations I've posted here somewhere as well... though I can't recall where.
There are even a couple spots where the beasts are called '
wolves' then '
wargs' and/or werewolves in the same sentence, and/or just a paragraph or two apart though obviously referring to the same
creatures.
If needed I can rummage around and see if I can find them... or do the study again at some point.
I could find no 'clear' evidence they were anything other than the same species twisted and bred to do different things... much like the many twistings of the
Orcs.
Some want to attribute anything that can 'speak' to an indwelling
Maia... but I've never found clear evidence that "must be" the case... however logical (or is that 'hopeful') such a stance may be.
We do know the '
spirits from afar' (which many assume to be Maia because, well, what else could they be?), came and inhabited both olvar and kelvar... but we sure don't see a lot of the
plants running around talking, and many beasts (like the fox) seemed to be able to think, but did not vocalize.
"A fox passing through the wood on business of his own stopped several minutes and sniffed. ‘
Hobbits!’ he thought. ‘Well, what next? I have heard of strange doings in this land, but I have seldom heard of a
hobbit sleeping out of doors under a tree. Three of them! There’s something mighty queer behind this.’ He was quite right, but he never found out any more about it."
Tolkien, J.R.R.. The Lord Of The Rings: One Volume (p. 72). HarperCollins. Kindle Edition.
Wargs were obviously bred to be big, fast, and mean. The purpose of the werewolves is (to me) so far a little more unclear, other than another fear-factor, and some day I may go back to it.
Some Maia may have decided to take the form of a
Warg or Werewolf, or some 'spirit' (maybe Maia) to inhabit one...I could locate no clear reference - but the beasts themselves were just more of
Morgoth and (mostly)
Sauron's animalia twisted to their services in one way or another.
As to the 'vampires' being bats, there's absolutely no evidence they were
Maiar in my view.
Though it is said they were among the 'spies', there's no reason to think the ability to understand them was any different than
Gandalf's or
Radagast's ability to 'communicate' with
animals.
or the "old thrush" who could be understood, or old Roac and Carc. And of course there's the exchange where
Balin the
dwarf is suspicious of the 'nasty, suspicious looking crows' who were calling 'ugly names' after the troup... but the
dwarves had great friendship with the
ravens, who formerly brought them secret news.
Were they all maiar? We hardly think so. This is a fantasy in many ways... yes... a fantasy. Fantastic things happen in a fantasy.