Community identification
Human Head Louse
Pediculus humanus capitis
- Order & Family
- Order: Psocodea (formerly Phthiraptera); Family: Pediculidae
- Size
- 2.0 mm to 3.0 mm (about the size of a sesame seed)
Natural Habitat
The scalp and hair of the human head, typically remaining close to the scalp for warmth and food.
Diet & Feeding
Obligate parasites that feed exclusively on human blood several times a day.
Behavior Patterns
They are wingless and cannot fly or jump; they move by crawling. Females lay eggs (nits) and glue them to hair shafts close to the scalp. They can only survive for about 24 to 48 hours away from a human host.
Risks & Benefits
They cause intense itching and scalp irritation. While they do not transmit diseases, scratching can lead to secondary bacterial skin infections. They offer no benefits to humans or the ecosystem.