A rod-shaped bone found in the penis of many mammals, including carnivores and primates, but absent in humans and some others.
From Latin 'baculum' meaning 'staff,' 'rod,' or 'stick,' used by anatomists to describe this distinctive bone structure.
The baculum is a scientific mystery—most mammals have one, but it's missing in humans, horses, and whales; scientists debate whether we lost it or never evolved it, and the answer might be hidden in our sexual behavior!
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