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This is Scientific Americans' 60-second Science. I'm Jason Goldman.

In the shadow of Wangshan Mountain in southeastern China,

lives a beige frog with black stripes.

The concave-eared torrent frog, or Odurana Tormoda,

gets its name from its unusual hearing apparatus.

It has kind of ear canal-like structure, like humans, and like most mammals.

For most pro-species, the eardrums are located on the body surface, on the lateral part of the body surface.

But here the eardrum is invisible because it is embedded deep inside the head

in the skull. Biologist Albert Feng from the University of Illinois at Urbana-Champaign.

Back in 2006, Feng and his colleagues discovered that this unusual anatomy allows the frogs

to hear ultrasound, which includes frequencies greater than

20 kilohertz. Biologists had always assumed that ability was restricted to some mammals,

because it was only known in bats, whales, dolphins, and some rodents. We can't hear in that range.

The streams that the frogs live in are quite noisy, but most of those sounds are low frequency.

By restricting their vocalizations to the higher frequencies, including ultrasound,

the frogs are better able to hear each other.

The higher the frequency, the less the signal is distorted or at least masked by the ambient

...