Why Do Men Have Nipples? - 12 Days of Evolution #7

The video explores why most mammals, regardless of sex, have nipples. It delves into the evolutionary reasons for the existence of male nipples, explaining that they persist because they are not costly to maintain. The video also discusses how traits can exist without providing a specific advantage and how they can be repurposed over time. It concludes by emphasizing that not all traits are adaptations and encourages viewers to stay curious.

What new insight or understanding did you gain from this video?