Head louse

The scalp and hair of the human head, especially behind the ears and near the neckline.

Obligate ectoparasites that feed exclusively on human blood several times a day.

They do not jump or fly but crawl between hosts via direct contact; they lay eggs (nits) firmly glued to hair shafts.

Causes intense itching and secondary skin infections from scratching; they are a significant social nuisance but do not transmit major diseases.