Fact file
Order: Pthiraptera
Body length: 0.5 - 10mm
Species: World - 3500+, UK - 539
Lice are parasites living on mammals and birds. They feed on the blood, skin or fur of their host animal. Most school children will have head lice at one time or another. They pass from head to head and can be very itchy! Unlike fleas they do not jump.