If you’re confused: Birds are dinosaurs, crocodiles aren’t; note the “closest living relatives

  • dogsoahC@lemm.ee
    link
    fedilink
    English
    arrow-up
    37
    ·
    3 months ago

    Though, isn’t being part of a group the closest you can get in terms of relatedness?

  • ShaunaTheDead@fedia.io
    link
    fedilink
    arrow-up
    8
    arrow-down
    1
    ·
    3 months ago

    I actually just learned this recently, but dinosaurs differ from reptiles in that dinosaurs have legs that are under their bodies whereas reptiles have legs that splay out to the side. So all mammals, and birds, with legs directly under their bodies are probably more closely related to dinosaurs then reptiles.

    • GiveMemes@jlai.lu
      link
      fedilink
      English
      arrow-up
      6
      ·
      edit-2
      3 months ago

      No. Tetrapods and reptiles diverge well before dinosaurs. All dinosaurs are diapsids as compared to mammals, which are synapsids. A dimetrodon (the one with the big sail) is not actually a dino and is more closely related to humans than it is to dinos.

      To expand on this concept, all dinosaurs and humans are technically considered bony-fishes as they are nested within the bony-fishes clade, osteoicthyes, but thats probably spelled wrong (this recently was used as a way of protecting some types of animals in a law that is supposed to protect fish as a category), and all birds are technically dinos, so when we refer to non-avian dinos, it just means dinosaurs excluding the birds!

  • Onno (VK6FLAB)@lemmy.radio
    link
    fedilink
    English
    arrow-up
    5
    ·
    3 months ago

    Forgive my ignorance on the subject, but huh?

    Clearly I missed a briefing somewhere. I thought that crocodiles were from that era, or is that the joke that I’m somehow missing?

        • Codex@lemmy.world
          link
          fedilink
          English
          arrow-up
          7
          arrow-down
          1
          ·
          3 months ago

          It might be easy to brush off my complaint as a case of paleo-pedantry, but word choice matters. “Dinosaur” is a word for a specific group of creatures united by shared characteristics and which had their own evolutionary history—it is not a catch-all term for anything reptilian and prehistoric.

          We have known about this distinction for a long time, and I bet that your average 10-year old paleo fan would know not confuse the groups.

          https://xkcd.com/2501/

        • RandomStickman@kbin.run
          link
          fedilink
          arrow-up
          13
          ·
          3 months ago

          Here’s my take:

          Low IQ: crosc looks like dinos so they are the cloests living relative to dinos. Mid IQ: birds are direct descendents of dinos so they are the closest living relatives to dinos. High IQ: since birds are direct descendent they are just dinos, not a relative. Which makes crocs the next closest living relative to dinos/birds.

        • ProfessorOwl_PhD [any]@hexbear.net
          link
          fedilink
          English
          arrow-up
          4
          ·
          3 months ago

          No, the joke is that crocodiles aren’t dinosaurs despite looking like them and being around at the same time, just closely related, while birds technically are dinosaurs, just not the big lizards of 64 million years ago.

          • Onno (VK6FLAB)@lemmy.radio
            link
            fedilink
            English
            arrow-up
            1
            arrow-down
            1
            ·
            3 months ago

            So really, this is not a joke about dinosaurs at all, it’s a statistics joke … which would put this meme in the wrong community 😇

              • Onno (VK6FLAB)@lemmy.radio
                link
                fedilink
                English
                arrow-up
                1
                ·
                3 months ago

                I was making a joke about statistics not being science, but it’s clear that not everyone got the joke … pretty much the same as the original meme.

                (This is humour, laugh.)

                • propter_hog [any, any]@hexbear.net
                  link
                  fedilink
                  English
                  arrow-up
                  1
                  ·
                  edit-2
                  2 months ago

                  Statistics is maths, and maths is science insofar that you can’t do science without doing maths. And I’d further argue that statistics is perhaps one of the three most important branches of maths to science, the other two being linear algebra and calculus. Also, it’s been established previously that maths jokes are definitely welcome here.

  • Bye@lemmy.world
    link
    fedilink
    English
    arrow-up
    3
    arrow-down
    10
    ·
    3 months ago

    This is dumb as rocks

    The most charitable interpretation is “well crocodiles didn’t change in the last 100 million years but birds did so that means maybe crocs are closer since birds evolved to get farther away”

    That’s dumb because both birds and crocodiles have been changing the whole time. Just because crocs look more similar to their fossils, doesn’t mean they haven’t been evolving/drifting/etc.

    Same thing any time someone talks about “sharks haven’t changed”. It’s dumb.

    This is some dunning Kruger shit.

    • TxzK@lemmy.zip
      link
      fedilink
      English
      arrow-up
      16
      ·
      3 months ago

      It has nothing to do with if the said animal were evolving or not. Birds and Crocodilians are the only living animals of the Archosauria clade. Since birds are dinosaurs, technically they aren’t their relatives. So Crocs are the closest living relatives of dinosaurs (and birds), since they belong in the same clade and shared a common ancestor more recent than anyone else alive.