Cully has always done this, and he seems to be a pretty normal altered male
ferret.  When I first got him and he was so aggressive, I asked my vet if
she thought there was a possibility that he hadn't been completely neutered,
but she thought not (I forget the reason why now).  LIke your ferret, he
seems to do this when bored, and I think it's a habit he picked up when he
was shut in his cage all the time by previous owners.  It's somewhat
embarassing when you have friends over and they ask "what _is_ that ferret
doing?" but otherwise it seems to be nothing to worry about.  Then again,
Cully's cookoo to begin with, so others may feel free to express other
opinions ;)
 
Regina
and Cully and Amelia too!
[Posted in FML issue 1997]