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Fionasye

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  1. I am not sure, if relevant to the problem sorry but i was just reading about them and found this out.

    Millions of years ago, a small, unremarkable fish called the Mexican tetra started swimming into the caves of eastern Mexico. In the all-encompassing darkness of these limestone caverns, the tetras’ eyes, which take a lot of energy to build and maintain, were useless luxuries. Over several generations, the cave fish lost them entirely. Today, they are born with small eyes that gradually waste away as they get older.  The tetras’ eye sockets, however, don’t go to waste; they can use them to store fat. Blind cave fish are stockier than their cousins that live on the surface, and some have fat-filled humps

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