Quote Originally Posted by xdeus View Post
Are there several groups of rats or just one group that consistently chews through the tub? I have one group of rats that constantly chewed a hole in the corner of their tub. After replacing the tub several times, I just let them chew a hole and left them there. To my surprise they quit chewing after the hole got to be about 2 inches in diameter and stayed in the tub. I've had them in the same tub for months now and they seem perfectly content with their hole and view.

However, I'm careful not to mix rats in that tub with any others because I don't want them teaching the others their new skill.

Yours probably come out at night and party! Of course they aren't going to mess up a good thing by letting YOU know what's going on!