Fireflies use their amazing bioluminescence to find mates of the right species. Males fly around and emit a series of flashes in a pattern that differs from all other species. A female, perched nearby, may respond with her own species-specific signal. The male immediately flies towards her and, after a few more exchanges, its wedded bliss! Well, not always. Females of a few species have learned to imitate other species signals and, when their males arrive, they eat them. These femme fatales are exhibiting a form of __________. .