KARSTEN SCHNEIDER / SCIENCE PHOTO LIBRARY KARSTEN SCHNEIDER / SCIENCE PHOTO LIBRARY
Animation of a head louse grasping strands of human hair. The head louse (Pediculus humanus capitis) is a small parasitic insect that lives its entire life in the hair on the head of humans. Infestation, called pediculosis, is very common and can cause an itchy scalp, but it is not medically significant. Nonetheless its eggs, called nits, are unsightly, and the condition is often targeted at schools.
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