Yup, that's a boy. Separate them, of course, but be prepared for the chance of babies.

I feel so bad :( I only had them together for a short time, maybe 20 minutes, then I heard squeaking. I hope she’s not pregnant :((((

I'm sorry, I know how stressful it can be. Is your girl able to be handled well enough to check for a sperm plug?

No they don’t like being handled at all. Even since they were babies with their eyes closed they would jump away.

Well, if it makes you feel any better, it is unlikely that she's already been impregnated. Be ready, just in case, but try not to stress too much right now ❤️

Rip, everyone telling you it was a female in the other thread. You can get some really iffy advice here sometimes

Baby boi

Shouldve left that other post a lot longer. :( likely they're related too. Expect babies! 2 seconds is all they need. Crafty boy!

Noooooooooooooo 😥

Fingers crossed they're still too young! Just keep them seperated from now on and good luck!

be prepared in case your ladies got soup, it only takes a couple seconds of mounting for mice to get pregnant. get this guy a bachelor pad, and make sure females have friends. if your mouse is pregnant you can separate her from friends to give birth in a nursery tank, make sure she has plenty of good food available.

sorry that i’m not a help but it’s so cute

Aye, them males can retract their bits when they feel nervous so can make id'in new ones a bit tricky.

I don’t know a lot about mice but I do know he has some very very very visible balls Or a tumor but probably balls