I have learned that only humans and whales go through menopause.
@oakreef Interesting! Both long lived, highly social, cultural.
I've seen it convincingly argued that menopause is a social trait, allows the most experienced members of a group to share attention/experience with the youngest generation. In humans, given the extraordinarily high mortality rate of women in childbirth, probably also drastically improved life expectancy for the most valuable minds in a community.
@oakreef Weird! And it's hard to accept it could be accidental - unless it provides some benefit, it's reducing fertility for nothing. It's got to be for _something_.
Nope, menopause is common in primates, unless you carefully define it to be exclusively human. The hormonal changes leading to reduced or stopped menstruation, and either reduced fertility or the end of fertility, occurs during in monkeys and great apes. The first studies of this were in the 80's.
As usual, there are always people who want to draw definitions of things so that humans come out as special magical beings different from all other animals...
@oakreef @tfb Which in turn might be an artefact of Whales and Humans being so long-lived.. I wonder if the mortality rate of great apes were lower, would we observe a proportionally similar menopausal period, then.
Totally unrelated BTW but I was recently looking at papers around brain size and intelligence among humans vs. nonhuman sapient species like whales, parrots, and elephants, which was a whole other interesting thing about convergent and divergent evolution in social and intelligent animals. Really interesting to learn from differences with our distant cousins to get a better bearing on ourselves.
@seachaint Interestingly I saw this because of an article about observation of menopause in a species of whale that is *not* highly social and where "grandmothering" doesn't happen much, raising the question of whether it provides some other benefit.
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