Well of repeted nuisince is the desire my rats seem to have to chew their big water bottles - regardless of them being full or not.



And I really don't know why this hadn't occured to me earlier as a cheap and easy bit of preventative maintenance:



Not only does it prevent them from chewing the bejeebus out of the plastic it also seems to prevent them from using the water bottle as a climbing post - they slip right off the aluminum!