"Jellyfish have many eyes but no brains."
Cubozoa (box jellyfish) are largely known for an extremely venomous and often fatal sting, but equally unusual is the fact that they have true eyes, with a developed structure similar to the eyes of humans (including a cornea, retina and iris). All told, they have three different types of eyes, with 24 eyes in total, but no brain -- merely a nervous system that processes the visual information relayed by the various eyes.
askmen.com
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