The bell snake develops a sound mechanism for "human ear deception"

Scientists said that the bell snakes have developed a smart way to deceive humans and persuade them that the danger is more closely close to them than they believe to stay away from them..

These snakes move their tail strongly to make a sound like the bell when feeling any danger, but they can suddenly adjust this sound to a much higher frequency so the sound is stronger and frightens the person from a distance.

In the tests, the rapid change in sound made people who were next to the snake believed to have been much closer than they actually.

The researchers say this mechanism has evolved to help snakes avoid exposure.

The sound of the bell snake's tail has always been a distinctive theme in films.

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The sound is caused by the rapid vibration of solid keratin rings at the tip of reptile tails.

Keratin is the same protein that makes our nails and hair.

The main ability to make this frightening noise is that the snake is able to shake the tail muscles up to 90 times per second.

It depends on this strong vibration to warn other animals and humans of their existence and not to approach them.

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Despite this audio warning, the bell snakes are still responsible for the majority of bites registered against humans in the United States of America, which amount to 8,000 bites every year.

The researchers have realized for decades that the snake can change the frequency of the bell sound it releases, but there is little research on the importance of the transformation in the degree of sound.

In this study, scientists conducted experiments by moving a person in the shape of a person near a bell snake and recording its response.

The closer the body from the snake, the more vibrations frequency until about 40 Hz.Then a sudden sound leap was followed by between 60-100 Hz.

To find out what the sudden change in the degree of sound, the researchers conducted more work with human participants and a virtual snake.

Participants were looking at the increasing rate.

Scientists found that when a sudden change in the frequency occurred at a distance of 4 meters, people believed in the test that the snake was much closer, about one meter away from.

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Researchers believe that the sound switch is not just a simple warning, but it is a complex communication signal between these types of snakes.

"The sudden shift to a high frequency mode works as a smart signal that deceives the listener about the actual distance between him and the source of the sound," says the main author of the study Boris Chagano, from the University of Karl Franks in Grats, Austria.

He added that "the wrong interpretation of the distance on the part of the person and his avoidance of approaching provides a margin of safety from the distance between the snake and the person."

The authors of the study believe that the behavior of snakes benefits from the human auditory system, which has evolved to explain the increase in the height of the sound as something that moves faster and approaches.

"Evolution is a random process, and what we may have today as a good design is in fact the result of thousands of experiences on snakes facing large mammals.".

He added that "the snake has evolved jointly with the auditory perception of mammals through experience and error, leaving those snakes most able to avoid trampling on them.."

The study was published in Current Biology.