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When I grew rabbits, I had a pair, one male and one female. And while the female's nipples were quite prominent, especially after giving birth, I don't remember the male having any nipples at all.

Do males of other mammal species, have nipples like human males, or is it a trait that's unique to Humans?

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You never heard the old saying "worthless as teats on a boar hog?" – RioRaider Nov 4 '12 at 18:27

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At the very least, I know that male primates also have nipples like female, though they are very close relatives to human. On the other hand, in some of my dissection labs, I noticed that male pigs also have nipples just like the female ones. It seems to be the case that most male mammals have nipples, which probably has to do with mammals being breast-feeder and their developmental pattern.

There is a page on Wikipedia that I found about this topic: http://en.wikipedia.org/wiki/Nipple#In_male_mammals

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I can also testify as to the presence of nipples on male dogs and cats (or, at any rate, my male dogs and cats). – terdon Oct 8 '12 at 16:10

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