An evolutionary war is being played out between the bat,
which uses ultrasonic calls to locate insect prey, and the moth, which uses
microscale ears to listen for the approaching bat. While the highest known
frequency of bat echolocation calls is 212 kHz, the upper limit of moth hearing
is considered much lower. Here, we show that the greater wax moth, Galleria
mellonella, is capable of hearing ultrasonic frequencies approaching 300 kHz;
the highest frequency sensitivity of any animal.