I made this comic about a random thought I had.

  • Matombo@feddit.org
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    14 hours ago

    Because birds use more energy to convert toxins filtered by kidney to uric acid and pop that out to safe water.

    Mamals convert it to urea which is then peed out, which looses the body some water, but requires less calorie.

    Fish don’t do that at all, they are basically constantly peing out whatever their kidney is filtering, which requires the least amount of energy but a constant supply of water.

    ps.: the acid part in uric acid is why bird shit is so nasty to buildings and car paint etc. if it is not cleaned fast enough.

  • MissJinx@lemmy.world
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    2 days ago

    You can only throw up through your mouth+nose. So we do have 3 orifices that expel 3 different types of waste. You could even count 4 with the ear and wax. Tears?! Sweat?! lots of gross stuff