Rats nibbling the corners of the tupper

[MootWorm]

Isn't them chewing wood not a great thing? Unless they digest that stuff.

On the contrary, if they don't get wood or something hard to wear down their teeth, they can and will get overgrown to the point that they can't eat. I've seen it myself many times. Generally, this isn't an issue for people who feed lab block. But it can and will happen to those that rely solely on commercial pet store feed. Fun fact