Defence against predators Primary defences Methods For prey with defences
 Warning sounds allow the animal to stay hidden. Moths of the Arctiidae and Ctenuchidae families are foul-tasting, but might be eaten by bats at night. These moths emit clicks when they hear bats in flight. That the clicks work is shown by a neat experiment. Bats eat mealworms if thrown up by the experimenter. They ignore the mealworms thrown by hand if moth clicks are played at the same time.