seeing as how i think the highest charm is something like 55 u should be able to charm these little fluffy fellows and sick em on a couple dragons and then charm another till the dragon dies.(lol a bat killing a dragon)
Had i not been there myself, i would have flamed that first comment badly.
We have killed these and they do have a batskull sometimes. At first i thought someone gave the earing to it. The bats seem to be more rare then the drop. maybe cause of where we were. /shrug