Castrate is the word I was looking for! So is that what it looks like happened? Or are you saying that isn't the case because they are able to pull them up? As far as I would imagine all 7 of these mice grew up together.... but the two with this issue are constantly having the only non white (its brindle) mouse going after them. Should I just feed these two off? It doesn't look like a prolapsed uterus to me. I'm guessing male or female I won't be making babys with either any time soon?