agression

Hi! New here! Made this post since I couldn’t exactly figure out the answer to my questions anywhere on the web, and before I begin my rats are getting neutered on July 10th that’s already been booked way before any of this happened it’s just that’s the soonest their vet could get them in. I...

So i have 2 older rats about 1.2 years old and i decided to get 2 little friends for them (all males). 1 of the new rats sadly passed way the other one is fine though and is now 4 months old but hes suddenly biting my other rats (since a week and a half 2 instances). They still cuddle and play...