Batty?

[Mithalwen]

Well I suppose he might be joking.
http://www.aceshowbiz.com/news/view/00056650.html

[Kuruharan]

At least the bats are described by Tolkien. I don't recall it specifically saying that the eagles fought them, but for changes that would be one of the least off the wall ones PJ and Co have come up with.