The frog's vocal organs are the vocal cords. Located above the cartilage of the laryngeal valve. Some male frogs on both sides of the corner of the mouth and can drum up the vibration of the external vocal sac, the vocal sac produces *** sound, so that the frog's song is majestic and loud.

After the rain, the pond, you will hear the male frogs call each other echo, one after another, converging into a chorus. Scientific workers pointed out that the chorus of frogs is not their own singing, but there are certain rules, there are lead, chorus, sing, sing and other forms of accompaniment, each other closely with the chorus, is a veritable chorus. Chorus is much superior to solo singing because it contains more information.

The chorus is loud and clear, and spreads over a long distance, attracting more female frogs, so frogs often use the chorus form. Frogs love to sing loudly on rainy summer days, and in the heat of summer, frogs usually hide in the grass, occasionally shouting a few times for a short period of time. If one calls, the one next to it will call a few times along with it.

Expanded:

Ultrasonic Frogs Discovered:

According to Nature Magazine reported, scientists in the Huangshan Mountain found a very special frog, they communicate with each other by emitting a kind of ultrasound that other animals can not hear, this is the first time to find that animals other than mammals can use ultrasound to communicate with each other through the special structure of the frog's ears, the study of the frog's ears, which can help to invent a new technology to help people in the environment with a lot of background noise in order to hear the sound that they want to listen to.

They live in special environments, such as loud waterfalls and rapids, that can overpower the voice of the frog with the loudest call. Under these conditions, the frogs slowly evolved, and instead of relying exclusively on their ordinary calls to convey information, they switched to communicating with ultrasound.

It was a clever method and an evolution that surprised scientists. The phenomenon shows a new example of independent evolution, which occurred specifically in this frog in an environment of loud background noise.

Baidu Encyclopedia - Frogs (Amphibia, Anurans)

Baidu Encyclopedia - Ultrasonic Frogs