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However, this form of communication carries risks. Predators may eavesdrop on these light signals, detecting prey that flash too frequently or brightly. In response, some species have evolved “private channels” by producing light outside the visual range of common predators or by using extremely brief flashes that are difficult to locate. As one marine biologist noted, “In the deep sea, every light signal is a gamble between being understood by a friend and being eaten by an enemy.” magoosh toefl reading practice