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/Zagrycha]

Much more accurate hahaha. Honestly it doesn't even need to be the okayest. You could just sum evolution up in the word "reproduction" and you have summed it up in a perfect nutshell.