I remember seeing a documentary where they showed fish having "eye" spots on their rear: https://en.wikipedia.org/wiki/Foureye_butterflyfish https://en.wikipedi

I remember seeing a documentary where they showed fish having "eye" spots on their rear: https://en.wikipedia.org/wiki/Foureye_butterflyfish https://en.wikipedia.org/wiki/Foureye_butterflyfish. I found it such a hack.