Louse (likely Head Louse)

Scientific Name: Pediculus humanus capitis

Order & Family: Order: Psocodea, Family: Pediculidae

Size: 2mm to 3mm (larvae/nymphs are smaller)

Louse (likely Head Louse)

Natural Habitat

The human scalp and hair

Diet & Feeding

Exclusively human blood, feeding several times a day

Behavior Patterns

Obligate parasites that cannot fly or jump; they move by crawling. They glue their eggs (nits) to hair shafts and spend their entire life cycle on the host.

Risks & Benefits

Risks include intense itching (pruritus) and potential secondary skin infections from scratching. They do not spread disease. There are no ecological benefits to humans.

Identified on: 1/3/2026