Head Louse (Nits)

Human scalp and hair, specifically close to the skin surface for warmth

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

Females lay eggs (nits) at the base of hair shafts using a glue-like substance; they cannot fly or jump and spread through direct head-to-head contact

Causes intense itching and scalp irritation; they do not transmit diseases but can lead to secondary skin infections from scratching