#behavior

Hi guys! It's been a while. One of my rats died recently and left my year and a half old boy Nemo behind. So I got him two baby brothers (I'm not good with rat ages, but they're not old at all), Craig and Tweek. I introduced them and Nemo showed no aggression, groomed them, shared food, cuddles...

Maybe someone here can help me. 4 days ago I adopted a rat, she is 8 months old and I wanted to add her into my group. I don’t know what the owner did with her before, she is very curious but also starts biting very fast and aggressive, it’s not just a nipping, she is really biting. Does anybody...