Bioluminescence is an important factor for survival in many animals because it serves several critical functions, including communication, camouflage, and predation. One example mentioned by Edith Widder is the use of bioluminescence for communication and mating in the deep-sea anglerfish. The anglerfish has a bioluminescent lure that attracts prey, but it also uses it to attract a mate in the perpetually dark depths of the ocean. This example illustrates how bioluminescence can be crucial for the survival and reproductive success of certain species in their natural environments.
