I don't think the Pterodactylus idea is so dumb. I mean, even if you didn't have dinosaurs in Middle Earth, if you stick leathery wings on some kind of scary, lizard-like creature, you pretty much come up with a Pterodactyl.
A bat-like creature, terror-wise, just doesn't cut it for me. It would just look like a giant, flying lizard-Pug.
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