mechanical sound

Mechanical sound in biology refers to sounds produced by physical contact between body parts or between a body part and the environment, rather than through the respiratory system. Many animals have specialized structures for this. For instance, crickets and grasshoppers rub their wings together, while cicadas use tymbal organs. Rattlesnakes use their tail tips, and many mammals stamp their feet or slap their tails on water. Fish produce sounds by moving bones or teeth, and some use their swim bladder as a resonator. Birds may produce sounds with modified feathers during flight. These mechanical sounds serve various purposes, including communication, warning signals, and mating calls.123