There are many types of lice! The one we are most concerned with is called the head louse, or Pediculus humanus capitis. Human Head lice are parasitic insects sometimes found on the head and, more rarely, the eyebrows and eyelashes of people.
The Lice Life Cycle moves pretty quickly. There are three stages of the lice life cycle: egg, nymph and adult. An adult louse can lay over 5 eggs a day. Missing one louse during treatment, can lead to restarting the entire infestation.
Most people never see an adult louse. They move quickly, and run for cover as soon as the hair is disturbed. Head lice have six claws. These claws are designed for efficient crawling, as they move from hair strand to hair strand. These claws also allow them to quickly move from head to head.
HEAD TO HEAD
A head-lice infestation occurs when a female adult louse moves to a new head and lays eggs. Once those newly laid eggs hatch, the lice will most likely stay on that head throughout their entire lice life cycle. Unless the hair is treated and all lice and eggs are killed or removed, the lice infestation will continue for however long the lice can live.