Human Head Louse
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea (Phthiraptera), Family: Pediculidae
Size: 2-3 mm (approximately the size of a sesame seed)
Natural Habitat
Exclusively found on the human scalp, hair shafts, and close to the neck and ears
Diet & Feeding
Strictly hematophagous; they feed on human blood several times a day
Behavior Patterns
Nits (eggs) are glued to hair shafts; the insects are wingless, cannot jump, and spread primarily through direct head-to-head contact.
Risks & Benefits
Risk: Causes intense itching and potential secondary skin infections from scratching. No known ecosystem benefits; they are parasitic pests.
Identified on: 2/22/2026