I agree that 2 males probably won't get along. years ago my husband got a feeder mouse and I saw it... it was no longer a feeder after that, it was my pet. She didn't look it at first but she was pregnant. They were all boys except for one. I kept the only girl (and one of the boys, separate from the girls). My friend took 4 of the boys, planning on keeping them in pairs. The boys had been together since birth (and before) but they still ended up fighting, majorly. My friend ended up separating them and having 4 cages rather than 2.