Head louse

Human scalp and hair shafts, primarily behind the ears and near the neckline.

Exclusive diet of human blood, feeding multiple times daily.

Flightless and wingless, they crawl swiftly through hair and cement their eggs (nits) securely to hair shafts near the scalp.

Causes intense scalp irritation, itching, and secondary bacterial infections from scratching, providing no known ecological benefits.