https://motherboard.vice.com/en_us/article/ev34nn/deaf-moths-use-acoustic-camouflage-to-evade-echolocation-bats

Many moths are deaf, which is dangerous considering the fact that their main predators are bats, which use echolocation to hunt. If a moth doesn’t know how much noise it’s making and at a given, how should can it know it’s at risk?

According to researchers from Bristol University in the United Kingdom, who published their findings in the Journal of the Acoustical Society of America (ASA) this month, there’s a simple explanation: deaf moths often grow fur designed to muffle the sounds they make.