this post was submitted on 12 Mar 2026
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Do male mice have nipples? Why?
That was my take-home open-book exam from a somewhat eccentric developmental biology professor back when I was in college. I remember that the answer is no (although they still have mammary tissue and can get breast cancer) but not why.
Apparently male horses also do not have nipples. I learned that just now when I was searching for "male mice nipples". TIL. I hope no one ever finds my search history.
They would probably rub on the ground
Or, or, the male horses with nipples spent too much time poking their own nipples with their penis for sexual stimulation and it means they removed themselves from the gene pool.
This means male horses selected for less and less prominent nipples until they became completely flat chested.
I like the way you think.