Head lice are insects that live on the human head.
They require warmth and blood to survive. Lice hatch from tiny eggs, called nits, which are attached to the base of individual hairs. Eggs hatch in about ten days and the lice reach maturity in about two weeks. Two weeks after hatching, the female louse will start laying as many as six eggs per day. The female louse lives on the host for about 20 to 30 days.