Which beetle makes a clicking sound by snapping its body to escape predators?

The click beetle makes its characteristic clicking sound by snapping a specialized body mechanism. When lying on its back, the beetle braces itself, stores muscular tension, and suddenly releases a spine on its prosternum from a notch in the mesosternum. The rapid movement produces the click and can launch the beetle into the air.

This spring-like mechanism is especially useful when the beetle has been overturned and cannot easily regain its footing. The sudden jump may startle predators and help the insect escape, although scientists have also proposed communication and other possible evolutionary functions. The exact defensive purpose of the sound itself remains debated.

Click beetles belong mainly to the family Elateridae, also called elaters, snapping beetles, spring beetles, or skipjacks. The name refers to a broad family rather than one single species. Their larvae are known as wireworms; some live on decaying material, while others prey on insects or damage agricultural crops.

A common mix-up is confusing the click with bioluminescence. Some click beetles, especially in the genus Pyrophorus, can glow, but their light-producing ability is separate from the mechanical clicking apparatus.