Lindsey Dougherty, a researcher from the University of California Berkeley, is at Lembeh Resort collaborating with Dimpy Jacobs to study the "Electric Clam" or "Disco Clam". It turns out that the lights are not from bioluminescence, but instead are only from reflection of sunlight in the ocean (or a dive torch!) The clams have a highly reflective tissue on the very outer edge of their mantle that is exposed and then hidden very quickly, so the change back and forth from the white reflective tissue to the red tissue creates the appearance of flashing.

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