The same female that only had 2 out of 13 babies live is now one of my worst rats. She chewed through her water bottle. There is a gaping hole in her water bottle. NONE of my other rats chew through their water bottles but she is completely psyco. She is the only one that spends her entire day and night trying to figure out how to get out of her cage. She will jump and hang onto the wire top over and over and over and she only gives up to sleep, eat and drink. None of my other rats do this. The only one that comes close is Monk and all he does is sit on top of his water bottle and give me that look that says "take me out and play with me."