Both my male and females thrash their tails around when they are really
preturbed (usually associated with agiatated chittering and/or hissing).  It
is definetely a sign of aggression and anger in my little ones - a
STOP-THAT-RIGHT-NOW-or-I'll-really-get-cheesed signal.  Anyone else?
 
Gwen
[Posted in FML issue 1639]