It then partially closes its mouth and emits a call that ranges from a frequency band audible to humans to an inaudible ultrasound band. “In light of the fact that amphibian diversity in Brazil ...

Scientists finally record Amazon frog’s ear-piercing screams - Leaf litter frog’s ultrasound distress call is extremely loud ...

Ultrasound is produced by high frequency vibrations beyond the range of human hearing. The frequency of ultrasound is therefore greater than 20,000 hertz. Ultrasound, like audible sounds ...