• unmagical@lemmy.ml
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    5 days ago

    That is a weird way of saying “Humans are bigger than birds,” even then though, I think on average the ostrich will win.

    Edit: I missed the flying part, but still.

    • Pommes_für_dein_Balg@feddit.org
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      5 days ago

      And you missed the part about conserving mass. A bird that can fly, with the mass of a human, would be much bigger than a human (cause birds have very thin, hollow bones).

      • unmagical@lemmy.ml
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        5 days ago

        You seem to be describing density (d = m/v). Preserving mass doesn’t really mean anything in this context without a discussion of volume.

        • applebuschOP
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          5 days ago

          why would you assume density would be conserved? all I said was mass so the density would absolutely be variable.

          • unmagical@lemmy.ml
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            4 days ago

            why would you assume density would be conserved?

            I didn’t. I pointed out that the person I replied was not describing mass.

  • Allero@lemmy.today
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    3 days ago

    Preserving a mass while maintaining the ability to fly would require you to significantly increase in size, which comes with all sorts of drawbacks.

    Humans can’t fly precisely because we’re too dense. Birds and other flying creatures have plenty of adaptations meant to reduce mass (or, rather, density) by all means possible.

  • toynbee@piefed.social
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    4 days ago

    When I was a kid I had a book called The Science of the X-Men (which that site lists for $11 but eBay lists for anywhere from $100-1500) that attempted to use real world physics to explain how the powers of the X-Men might work.

    Mostly the explanations came down to “I dunno, maybe black holes?” For example, it speculated that Jean Grey might have a microscopic black hole in her brain and had subconsciously learned to use it to open the other end in other brains and somehow vibrate the brain matter in a way to communicate telepathically.

    Anyway, I don’t recall whether it covered any shapeshifters, but if so, it probably handled it the same way Animorphs did (as others have mentioned in this thread), but with black holes instead of z-space.

  • Munkisquisher@lemmy.nz
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    4 days ago

    Are you also preserving the ratios of materials that the body is made of? We’d have very heavy bones for a bird (or a lot of bones at bird density) and probably not enough muscle to lift 2m long wings. Also all the keratin in our hair and nails wouldn’t make many feathers. We’d be a mostly plucked bird

  • potoooooooo 🥔@lemmy.world
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    5 days ago

    Just because mass is conserved doesn’t mean size/shape is conserved. If you’re always human-sized, you’re a pretty shitty shapeshifter. No offense.

    • applebuschOP
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      5 days ago

      thats… the whole point of the post. a bird with a humans mass would be huge. maybe you should have left your shitty assumptions in your ass. no offence.

  • Somebody_Else@feddit.online
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    5 days ago

    Biggest by mass, but a bird with the mass of a human cant fly (biomechanically impossible), so there needs to be magic fuckery involved.

    Meaning that a shapeshifter that turns in a flying bird with the same mass as a human would likely not be as large as you think. Humans are very dense compared to birds. Assuming we keep that density, we could be smaller than some of the larger eagles or carrion birds.

    • applebuschOP
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      5 days ago

      The largest flying animal to ever live, as far as we know, was the Quetzalcoatlus, which is estimated to have a mass up to over 400 pounds. Thats more mass than 99% of all humans, flatly disproving your claim. Just because theres no living bird with that mass doesn’t in any way mean its biologically impossible.

      Why would you assume it would have the same density as a human? This is an arbitrary restriction you’re adding to the scenario. Conservation of mass doesn’t require conservation of volume.

      • cravl@slrpnk.net
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        4 days ago

        I love the quetzalcoatlus, it’s one of my favorite summons in D&D. 80ft fly speed, flyby, 10ft reach, 22 (6d6+2) damage with a flying charge, and only CR 2. 🤌

      • Somebody_Else@feddit.online
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        4 days ago

        The largest flying animal to ever live, as far as we know, was the Quetzalcoatlus, which is estimated to have a mass up to over 400 pounds. Thats more mass than 99% of all humans, flatly disproving your claim.

        If you assume that we can change density then its possible sure.

        Just because theres no living bird with that mass doesn’t in any way mean its biologically impossible.

        If you just reshaped a person into a bird shape, its biomechanically impossible for them to fly.

        Why would you assume it would have the same density as a human?

        Because otherwise you arent turning a person into a bird, you are just making a bird (or other flying mammal) with the same approximate mass as a human.

        This is an arbitrary restriction you’re adding to the scenario.

        Seems implied to me

        Conservation of mass doesn’t require conservation of volume.

        So the original post would just be “a flying bird with the same mass as a human would be a huge bird”

        Which…sure

    • applebuschOP
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      1 day ago

      Yup they’d be a little baby elephant, unless they happen to be one of the heaviest humans alive, in which case they’d be a slightly older baby elephant lol.