Oh, I just remembered. I had very limited space breeding so everyone was expected to get along. There were times where I had adult father/son and adult brothers in the same bin with females and producing babies. This teaches us that there can be two males to a breeding group, but this probably only worked because they were raised in the same bin. As well as, males should not eat babies just because they are not their own.

This is more of an exception than a rule because of the temperament of my rats. I know I could have separated those males into their own group with females and reintroduced them later with females with no issues.

Those I mentioned above were NOT related to that blue male I mentioned previously.