What is lice? Although there are many types of lice, the head louse, or Pediculus humanus capitis, is a parasitic insect that can be found on the head and, more rarely, the eyebrows and eyelashes of people. Head lice (the plural form of louse) feed on human blood several times a day and live close to the scalp to maintain their body temperature.
There are three stages of the lice life cycle: egg, nymph and adult. Visit the CDC website for more information about the life cycle and what is lice?
Head lice have six claws designed for them to crawl from hair strand to hair strand. These claws allow them to 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. When those eggs hatch, the lice most likely will stay on that head throughout the entire lice life cycle. Unless the head is treated and all lice and eggs are killed, the lice infestation will continue for however long the lice can live.