What sound do pine bark beetles make?

Pine bark beetles produce a distinctive sound that can be described as a series of rhythmic "clicking" or "tapping" noises. This sound is primarily created when the beetles tunnel through the bark of trees, as they scrape and chew the wood. The noise may vary depending on the size of the infestation and the type of tree affected. In addition to the sound, the presence of pine bark beetles can often be detected by the accumulation of frass (beetle excrement) and the discoloration of the tree's bark.