Let’s keep things simple two rules.

  • No giving sentience, This is a no brainer issue.
  • Let’s keep it to beings under the Animilia kingdom. “mutated virus/bacteria” is a common trope.

To start:

Let’s modify ants to have lungs.

Most insects are constrained by the amount of oxygen they can acquire through their exoskeleton.

Imagine how big they can get if they didn’t have that constraint?

  • slazer2au
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    482 months ago

    Cows now have tetrodotoxin like Fugu fish. Incorrectly prepared cows now have the chance to kill you.

    • flicker
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      172 months ago

      Why did I read this like patch notes on a game?

    • @threeduck@aussie.zone
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      102 months ago

      Opposite monkey paw situation, as cows are no longer farmed due to the poison risk, global emissions are massively reduced. And the huge amounts of land dedicated to feeding cows is returned to forestry, further reducing emissions.

      The poisonous cows solve climate change long before the vegans can.

      • @Achyu
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        11 month ago

        How much does the cattle rearing industry contribute to global emissions?

        • mbfalzar
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          61 month ago

          According to the USDA, the US cattle industry contributes about 3.7% of US greenhouse gas emissions, and livestock as a whole is around 14.5% globally on a cursory search

  • Jo Miran
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    472 months ago

    A breed of 100+ pound Chihuahua with the same temperament as the original.

  • Remy Rose
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    412 months ago

    Ok, take this with a grain of salt because I read about it ages ago in a dubious pop-sci book and my memory is shaky. One time, they tried to gene edit yeast to be able to survive much higher alcohol concentrations. There’s lots of good reasons to want to do this… Beer/wine is just about the strongest beverage you can make without distillation of some kind because the yeast dies. Making way higher ethanol yields just from fermentation makes biofuel way more viable. Stuff like that.

    EXCEPT… It nearly escaped, and was able to survive on it’s own. Yeast is very ubiquitous in nature, so a wild yeast that can tolerate massive ethanol concentrations could conceivably have altered life on earth as we know it.

    A cursory internet search isn’t turning up anything about this, but I’m pretty sure I read it in the book Everything Is Going to Kill Everybody, if anyone wants to look harder than I did.

  • @makeshiftreaper@lemmy.world
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    2 months ago

    Both male and female mosquitos now drink blood and they spit some of the last person’s blood in you when they drink, causing them to spread blood borne diseases

  • Give any animal the ability to photosynthesize. Now animals are of course complex creatures that need a variety of nutrients to function properly, and the number of chemicals we’ve seen be able to be photosynthesized is low, but imagine only needing to nude sunbathe for like a half hour to get enough sugars to fulfill your caloric intake, including the less efficient carb->protein/carb->fat conversion and pop a pill for some vitamins. Imagine if all animals had that as a baseline and just needed to hunt/forage for nutrients and vitamins to support auxillary functions.

    Overpopulation would be nearly impossible despite massive population booms, with the only real limitation being physical space and the social dynamics of any given species or interspecies interactions.

    • verdare [he/him]
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      2 months ago

      The reason you don’t really see animals that can photosynthesize (other than microbes) is because you don’t actually get that much energy per unit of area. Think about how much area a cow has to graze vs the surface area of the cow itself. And much of the cow’s surface isn’t even facing the sun.

      • @Admetus@sopuli.xyz
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        2 months ago

        Not only that but that the energy from the nutrients generated in a plant is solely used for cell growth and maintenance. Even remotely suggesting a self-warming and extremely kinetic mammal can get energy solely from the sun is nuts.

        • @notastatist@feddit.org
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          42 months ago

          I also saw a documentary about the ineffectiveness of the photosynthesis Enzyme. Maybe we need to alter this for something like mammal photosynthesis.

  • HobbitFoot
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    162 months ago

    In a push to deal with micro plastics, bacteria are developed to be able to break down plastic. Eventually, it gets into the plastic installed for a purpose and starts breaking that down.

    • @Zahille7@lemmy.world
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      82 months ago

      Damn I thought you were gonna say it gets into our bodies and eats us as we’re becoming part plastic nowadays.

      That’s a horror movie premise right there.

    • @AA5B@lemmy.world
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      1 month ago

      I thought I read about this for real a while back? In a bid to make plastic decay faster, make it out of cellulose with embedded bacteria that can break it down. It still happens too slowly for most plastic packaging

  • @Im_old@lemmy.world
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    152 months ago

    Mhh, insects in general IIRC are also constrained by the fact they have exoskeletons: i.e. their internal organs are just in a bag. So they can’t grow too much or they just squish I think.

    Imagine them being able to become vertebrates. You can have insects the size of cats I think before the osmosis breathing tubes they currently have are not a thing. Lungs would be the next thing I guess.

    Disclaimer: I’m not a biologist and just make stuff up from what I remember from high school biology, and it was last millennium!

    • @FrostyTrichs@walledgarden.xyz
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      102 months ago

      Disclaimer: I’m not a biologist and just make stuff up from what I remember from high school biology, and it was last millennium!

      If only the rest of the world was so honest!

    • @sbv@sh.itjust.works
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      102 months ago

      According to my sister-in-law’s then boyfriend (who was a biologist or an insect guy or something), spiders and insects can have lung-line organs called book lungs. So they have options. Creepy buggy insecty options.

      • @Im_old@lemmy.world
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        32 months ago

        Oh right, I’ve read about that on coconut crabs I think. There you go, they are already half there.

  • Cutecity [he/him]
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    102 months ago

    House flies start producing potent methamphetamine in their wings, which means the whole world has uncontrollable access to it.

  • techwooded
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    82 months ago

    Not very up on biology, so not sure if this would even be a thing, but I would say some kind of internal structure like plants allowing animals to overcome the square-cube law

  • @dutchkimble@lemy.lol
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    72 months ago

    All life with gills learn to breathe air without water, and suddenly all marine life is competing with us for land space

  • I Cast Fist
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    2 months ago

    Amaranth that can grow on sand and be watered with seawater

    Edit: ops, only animals? Make bees able to break down any kind of sugar into honey

  • @Railison@aussie.zone
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    1 month ago

    A malicious gene drive. Basically, use molecular tools to ensure that a gene is always passed down from a parent to its progeny, regardless of the other parent’s genetic makeup.

    Many choices available: propagate resistance to a pesticide for mosquitos, guarantee Huntington’s disease in a family, or crash a population of beneficial species by reducing fertility, to name a few.