The strangest behavior started a couple of days ago. All three have suddenly become aggressive. No one has struck at me but there is definite s'ing occurring. Normally all three are completely dormant during the day. Even if I mess with the tanks during the day (ie. fresh water, spot clean) they don't bother to pay any attention to me normally. But now if I open a door to the cage they all are out in a split second and s'ed up like they are ready to be fed or are in defensive mode. Now I know how crazy this sounds.....BUT....my female Bull Terrier just went into heat a couple of days ago. Is it possible they are scenting her?????? I did thoroughly clean their cages on Sunday and all three were fed then as well. What do ya'll think?