The Sound of Silence

Another example of speedy evolution? It has been reported that crickets, on the Hawaiian island of Kauai, have lost the sound production structures carried on their wings that are normally used to generate the song to attract a mate (https://www.theguardian.com/science/2018/feb/14/evolution-in-real-time-silent-crickets-still-singing-for-a-mate). These crickets still make the energetic movements that would normally result in courtship song but apparently benefit in the resulting silence by failing to attract  parasitic flies that would normally kill them. It is highly likely that the movements will rapidly disappear as well unless they signal mating vigour to females in the near vicinity.