http://www.natureworldnews.com/articles/72521/20250106/cave-dwelling-dwarf-crocodiles-mutating-new-species-researchers-say.htm
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The Abanda cave crocodiles (Osteolaemus tetraspis) are distinct from their forest-dwelling counterparts. They navigate through complete darkness, feed primarily on bats and cave crickets, and swim in pools of bat guano.
This unique habitat has caused their skin to turn orange, due to chemical bleaching from prolonged exposure to guano, which is rich in urea..."