They're wild animals, so I would expect them to defend themselves if they are harassed.
I don't recommend it, but they may just decide to hang on your arm if you keep them occupied with a nice juicy piece of fruit. Just don't blame or hurt the poor bat if something goes wrong in the process, since it's your own blasted fault.
I like the ears.
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The black flag is raised: Ban them all... Let the Admin sort them out.
I
know I'm going to have the last word... I have powers of deletion and lock.