Human Head Louse
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea, Family: Pediculidae
Size: 2.0 to 3.0 mm (about the size of a sesame seed)
Natural Habitat
Primarily live on the human scalp, attaching to hair shafts close to the skin for warmth.
Diet & Feeding
Obligate ectoparasites that feed exclusively on human blood several times a day.
Behavior Patterns
They are wingless and cannot jump; they move by crawling. Eggs (nits) are glued to the base of hair shafts.
Risks & Benefits
Cause intense itching and scalp irritation. They do not transmit diseases but can cause secondary skin infections from scratching.
Identified on: 1/14/2026