Head louse
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea, Family: Pediculidae
Size: 2.0 mm to 3.0 mm (about the size of a sesame seed)
Natural Habitat
The human scalp and hair, specifically clinging to hair shafts near the warmth of the skin
Diet & Feeding
Obligate blood-feeders; they consume human blood several times a day
Behavior Patterns
Wingless insects that cannot jump or fly; they move by crawling. Females lay eggs (nits) glued to the hair shaft within 1 cm of the scalp.
Risks & Benefits
Risks include intense itching (allergic reaction to saliva), sores from scratching, and secondary bacterial infections. They do not transmit diseases.
Identified on: 2/24/2026