[LocoRocoPanda]

So it's been about 3 weeks since Luppi's death and Aizen is acting seriously strange. Something about Rin (my new Syrian hamster) or her smell or something is ticking him off coz I can't think of anything else it would be.
He's been sulky and untame, last few nights he's suddenly started chewing on the bars of his cage and then this evening he bit my mum really hard and made her bleed. =/ He doesn't seem to be unwell or in pain so tonight I'm trying to see if keeping Rin in another room will calm him down or not but I'm at my wit's ends. He still seems okiie when I handle him so I don't know why he flipped out at mum.
Has anyone got any other ideas what could be wrong with him? I'm really worried about him. :'(