My Burms do that if they dont want to be bothered and Im trying to pic them up.. I have never seen a Ball do this and my Burms do not send a wave through their entire body, they Kick with one section. That is disturbing to me. You know your animal though, if he is huffy with a ornery temperament then i agree with the others..
Other than that I would check stool for internal parasites.
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