Well, the best way to tell is nipples. If you can see nipples its a female. Otherwise the Distance between the sex organ and the anus is the easiest way. You are safe until they are 5 weeks old really. So it might be easier to tell by then. Males have a much greater distance between the sex organ and the anus, females is much closer. Hope that helps. I really don't have any pics of my mice genitals to send. But truthfully does it matter? If they are just feeder mice leave them all together unless your interested in culling the males. Sexual maturity CAN happen at 5 weeks, but its usually closer to 2 months in reality. Its usually the buck that sired the litter who gets the does pregnant at a young age, most male mice don't realize how it works for a few months.
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Snakes? I just like to teraform!
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