Grasshopper Ears: How These Insects Hear Sound

The function of a grasshopper's eardrums is to detect sound waves. Grasshoppers have two eardrums, one located on each side of the abdomen. These eardrums are made up of a thin, flexible membrane that is stretched over a small opening. When sound waves hit the membrane, it vibrates, and these vibrations are transmitted to the grasshopper's inner ear. The inner ear contains a series of tiny bones that amplify the vibrations and send them to the grasshopper's brain. The brain then interprets the vibrations as sound.

Grasshoppers use their eardrums to detect predators, find mates, and communicate with each other. For example, male grasshoppers produce a distinctive song by rubbing their wings together. This song attracts females and helps them to find mates. Grasshoppers also use their eardrums to detect the sounds of predators, such as birds and spiders. When they hear a predator, they will often jump away or take cover.