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Cake day: July 6th, 2023

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  • It does. We also evolved embryo wasting. A measurement to reduce non-viable pregnancies. Except it also tends to dispose of potentially healthy embryo’s. They used to think 70% was wasted. But now they think it’s between 40 and 60%.

    This is a good thing, since it also enables more monogamous behaviour. More sex with the same guy = greater chance at conception. And reduces both male/male and female/female competition. So basically more coop-mode for everyone. Sucks only women suffer the drawbacks of this perk.

    Not only that. Paternal care is something other primates lack. But men did develop paternal care as prolactin levels in the brain increase when men see their baby. Paternal care interestinly enough, isn’t just a back-up parent in case the mom dies during labour. It’s invaluable. Especially to boys who prefer to learn from their fathers.

    On top of this, we also have meno- and andropause. Where people lose fertility. This is only seen in two other species. Both matriarchies where the leader is determined by her experience. Orca’s and elephants. Sticking around while not competing with her own children is amazing. It’s why we live so long. Fun fact. Male orcas only live 30 years, but female orcas live somewhere between 60 and 90 years. Makes that “women live 3 years longer than men on average” seem insignificant huh? In any case. Love your grandparents.

    Anyhow. It’s no surprise that forced mating is so common in nature, but not that common in humans. We are doing well despite rape still existing.


  • It would make sense. There are other behaviours that directly lower male aggression. Smiling and emotional tears.

    Which is awesome for babies since non-human primate males are known to kill offspring of other males in order to get the mother in estrus sooner.

    It’s also the reason women smile when nervous and cry a lot more. I suppose you have to if you lack offense and defence. E.g. estrogens slowing muscular and skeletal growth in the upper body. And growing hair enough for thermal regulation, but not enough to redistribute blunt forces. The reason beards exist is to protect the jaw.

    Interestingly, the main motive for men to commit homicide is dominance seeking behaviour. Men are more likely to kill every age with exception of infants. Women’s main motives for homicide are self-defence first and jelousy second. Infanticide is almost exclusively done by women. Often their own too. Never trust a woman who had a miscarriage with your newborn or your pregnant wife. High prolactin, loss of child and stealing babies is not just a human thing.

    I wonder how the willingness to kill your own (high risk and expensive) baby influenced human evolution. Since it’s the other way around in other primates. Recon it reduced rape to be merely a dominance thing rather than a reproductive strategy?












  • Shou@lemmy.worldtoMemes@lemmy.mlBig scared
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    20 days ago

    I mean. They are a matriarchy. So one could say the oldest is the alpha female. Who only accepts a new female in the group if she’s able to sexually satisfy the matriarch. And in case you want to see what bonobo gay sex looks like… don’t. It looks like two sopping tumors rubbing against each other.


  • On the contrary. Death is programmed.

    Mammals have fuck all in terms of adaptability tactics. Only way for us to adapt, is mix our genes and hope it suffices. The only way we can do that, is reproduction (funghi are op). Now that means more of us in a system that has limited resources (called carrying capacity). We die in order to prevent competing with our children.

    This is the reason animals have different lifespans depending on how likely they are to survive in nature. Take a rat and north american opossum for example. Far apart in terms of evolution and size, but have roughly the same life expectancy due to predation. Wolves can technically live up to 17 years, but become fertile at a very young age because the average lifespan in the wild is 5 years due to disease.

    It is also the reason menopause exists. It is rare, and found in elephnts and orca’s (both matriarchial species) and humans. This is because the life experience of the matriarch is too valuable. To be able to keep the matriarch around without her being able to compete with her own offspring, infertility is incuded. Post-menopausal orca’s pimp out their youngest sons because it is the best way to pass on genetics they have left. Imagine your mom being your finman.

    Humans are the odd one out here since we also have andropause, the male equivalent. A paradox on male reproductive strategy. Which afaik doesn’t exist anywhere else. This is why humans live so long compared to most mammals. Grandparents are important.

    Some animals don’t really age. Lobsters simply die from growing too big and unable to get enough oxygen. Some species of octopi stop eating after mating all the way to starving to death. Some animals mate until they die from exhaustion. The immortal jellyfish pretty much recycles itself. And bot just animals need death for renewal. New zealand has a forest which reproduces only after a forest fire. Which happen rarely over hundreds of years due to being in a region with lots of heavy rain. The trees themselves are pretty much immortal, and don’t reproduce while living.

    Senesence and death are essential for ecosysems and adaptation of life. Regardless of whether or not keeping an aging body alive is hard or possible.

    We age because our cells “choose” to. We have the equipment to live on “forever.” It’s just not our meta.