What sound do deathwatch beetles make as a mating signal?

Deathwatch beetles are known for producing a distinct tapping sound, which serves as a mating signal. This sound is generated by the male beetle tapping his head against the wood, creating a rhythmic noise that can be heard by potential mates. The tapping is not only a part of their courtship behavior but also helps indicatively communicate their presence to females, with the intensity and frequency potentially indicating their vitality and readiness to mate. This sound is particularly associated with their behavior inside wooden structures where they infest, making it a characteristic feature of their life cycle and attracting mates in the often secluded environments they inhabit.