While blindness is common among animals who dwell in caves, a study has found that at least two kinds of amblyopsid cavefish are also partly deaf. Researchers say a closer look at the Amblyopsidae cavefish family shows lower hearing may have been an adaption as a result of the aquatic caves' ambient noise. "The caves are very loud with the sound bouncing off the walls and stuff," said Daphne Soares, the lead researcher. "It would not be very adaptive for the fish to hear at a frequency where the environment is so loud."
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