Yet some of the bat's prey have managed to come up with their own systems of defense: In the Americas there is a kind of moth that can hear the bat's sonar and immediately lands on the ground when it hears the enemy approach; there are also insects that emit a high frequency signal which throws the bat's sonar into confusion and gives them a chance to escape.
美洲有一種蠹蟲，能接收蝙蝠音波，一發現「敵人」來襲，立刻迫降地面。也有一些昆蟲「以牙還牙」，也發出高頻率訊號，混淆蝙蝠視聽，趁機脫逃。