A new snail species... Found 800 meters (~2,500 feet) deep in a Croatian cave system. The parallel evolution of many unrelated species to colorless forms is an interesting piece of evidence for the theory of evolution. In those cave environments, there is no light at all – and so no evolutionary value to color. Since it takes energy (and food) to produce the color, organisms that don't produce less color in that environment have a small evolutionary advantage. Over time and many generations, you end up with organisms with little or no color (and no eyes, for similar reasons)...
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