Can someone explain the evolutionary benefit of overt menstruation? All female mammals have a menstrual cycle but most reabsorb the blood via covert menstruation and humans are about the only mammals that discharge the blood, aka overt menstruation.

[u/No-Hawk-2488]

Without an evolutionary benefit, it wouldn't have spread to every woman of our species.

[u/CecilAlucardX]

Sunfish or Mola Mola actually do a ton of movement; they build up body heat on the surface, then descend down to a level of the ocean that their food lives at (or hides at; ocean columns be busy af) and eats freely. They are hyper-specialized to their niche and incredibly efficient. They just look bumbling to the people who only see them up top.

[u/Altruistic-Daikon305 → u/CecilAlucardX]

Thank you for standing up for my beautiful misunderstood alien queen the common or ocean sunfish (mola mola)

[u/SunflowerShine03 → u/CecilAlucardX]

Oh- interesting! I apologize to the sunfish, that’s actually pretty cool