The concave-eared torrent frog communicates with ultrasound to overcome the noise of the waterfalls it inhabits:
The concave-eared torrent frog (Amolops tormotus) joins bats, dolphins and whales and a small number of rodents in the elite club of creatures that are able to communicate by ultrasound.A team led by Albert Feng of the University of Illinois found that male frogs of this species make high-pitched melodic bird-like calls that sometimes exceeded their recorder’s maximum range of 128 kilohertz — more than six times the limit of human hearing.