Head lice are wingless insects measuring 2.0 to 3.5 mm, that live in hair only on the human head. They can especially be found behind the ears and in the nape of the neck.1
They can neither jump nor fly but migrate when direct hair to hair contact occurs, using their six very powerful legs with hook-like claws.
Transmission takes place from human to human, objects such as commonly-shared caps, hair brushes and toys which come into contact with scalp hair2 are rarely the cause for transmitting head lice.
1. Feldmeier H. Diagnosis of Head Lice infestations: An Evidence-Based Review. The Open Dermatology Journal, 2010,4,69-71.
2. Cayon DV, Speare R. Indirect Transmission of head lice via Inanimate objects. The Open Dermatology Journal, 2010,4,72-76.