Deathwatch Beetles

Deathwatch beetles start their life as a pupa emerging from an egg and eat wood for 10 to 15 years, at the end of which they emerge as an adult beetle. At this point, they are blind and have less than a week to find a mate and have sex. So the male starts banging his head against the wood and hopes for a female to answer his calls. If he is lucky and finds a female, there are chances that she may reject him.