So, I know, weird question. But I was wondering, since male humans still have nipples from the foetus phase of development, does that mean other male mammals have vestigial nipples as well?
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Not all but I'd say most of them. Platypuses and echidnas don't have them, but that's because the females don't have them either. They secrete milk through openings in their skin
Male horses don't and rodents usually don't have nipples. That's all I can think of right now but I'm sure there are more.0