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Although lice and their nits are small, they are visible to the naked eye. Head lice can be white, brown, or dark gray. They are most often found in the hair at the back of the neck or behind the ears. The nits are round or oval specks that are tightly glued to hairs near the scalp. If you try to slide the nits off, they won't budge.
There are 2 orders of lice: the chewing lice and sucking lice. Both are ectoparasites, meaning they live and feed on the outside of the body of their hosts. Chewing lice are mainly external parasites of birds and with a few feeding on mammals.