PETER MATULAVICH / SCIENCE PHOTO LIBRARY PETER MATULAVICH / SCIENCE PHOTO LIBRARY
Head lice (Pediculus humanus capitis), about 3 mm in length, climbing strands of human hair. Lice are wingless, parasitic insects that spend their entire lives on the scalps of their human hosts. Their mouthparts, which are only visible when feeding, are adapted for piercing skin and sucking blood. The claws on their feet are used for grasping strands of hair.
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