The Human Penis Is A Puzzler, No Bones About It

Plants and Animals





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Humans and spider monkeys are the only primate species without a penis bone. Chris Makarsky

The penis. It comes in so many different shapes and sizes … and that’s just in humans. As you would imagine, different species have very different penises.

The males in most mammal species, including cats, dogs and rats, have a bone in their penis called a “baculum”, or “os penis”.

Of course human males don’t possess an os penis – in fact, humans are the only primate species besides the spider monkey to be lacking in this department.