What causes the rhythmic tapping or ticking sound associated with the deathwatch beetle?

Answer

The male tapping its head against the wood while calling for a mate

The characteristic 'death watch' sound is produced when the male beetle taps its head rhythmically against the wood surface in an attempt to communicate with a potential mate.

What causes the rhythmic tapping or ticking sound associated with the deathwatch beetle?
foodinsectwoodDeathwatch Beetle