I can’t stop imagining spider’s heads are a Buch of tiny owls holding together now (-_-)

  • Frjttr@lemm.ee
    16·
    5 days ago

    These are all jumping spiders, they have advanced eyes somewhat similar to ours. Other spiders don’t have this “iris-like” appendage.

    • pseudo@jlai.luOP
      5·
      4 days ago

      I just like to mess up with community content with sharing sometimes things that has to me a similaire feeling than what is share to the community, knowing full well it is not the topic (^_^) It stir up conversation and give a bit of fun break to our superb animators/moderators.

      Do worry I don’t spam. That’s just once in a while. It is also a chance for crossover community and community discovery.

  • ✺roguetrick✺@lemmy.world
    14·
    5 days ago

    As the eyes are too close together to allow depth perception, and the animals do not make use of motion parallax, they have instead evolved a method called image defocus. Of the four photoreceptor layers in the retina, the two closest to the surface contain a UV-sensitive opsin (visual pigment), while the two deepest contain a green-sensitive opsin. The incoming green light is only focused on the deepest layer, while the other one receives defocused or fuzzy images. By measuring the amount of defocus from the fuzzy layer, calculating the distance to the objects in front of them is possible.

    To explain this in simpler terms, their lenses focus the light on the deepest part of their retina, which is explicitly fuzzy for the surface part since it’s necessarily out of focus due to the distance between layers. Then their little jumping spider brains calculate how far something is based on the difference in fuzziness. Meaning they could theoretically judge that distance and jump on a flying insect with one eye. Eat your heart out depth perception using mammals.

    • kamenLady.@lemmy.world
      7·
      5 days ago

      calculating the distance to the objects in front of them is possible.

      So, the look of surprise is real