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Head lice are tiny parasitic insects that live in your hair and feed on blood from your scalp, says the Mayo Clinic.Symptoms of a lice infestation can include severe itching and the presence of nits, or lice eggs, visible when closely examining hair next to the scalp.
The Life of Lice. About the size of a sesame seed, head lice, six-legged parasites that live on the human head, are hard to see. And nits -- eggs that females glue onto hairs near the scalp -- are even more difficult to spot. But, luckily, lice can't live more than a few days away from the warmth and food the human head provides. And though they are hardy in some ways -- they can survive submersion for up to six hours (that's why swimming and showers don't kill them) -- they can't jump, hop, or fly.