My rat ate some polystyrene packaging?

  Is this safe or should I worry?
Rats will digest about anything. You shouldn't worry to much about it unless, he/she starts making weird sounds, noises or movements then you should take him/her down to the vet . You should be fine. Hope this helps!=)
oh god it's fine hhahaha rats can eat anything!! think about it most of them live in a sewer. just don't let it eat any toxic wast D: