Head lice are small, wingless, blood-sucking insects. They live in the hair on your head and feed off the blood from your scalp. A louse (a single.
Head lice (Ppediculus capitis) suck blood from the scalp and their bites can itch. Eggs and lice are visible with the naked eye. Head lice are grey (translucent), brown or black, or sometimes even red (if they have recently fed).
There are two kinds of lice: chewing lice, which feed on the skin and debris, and sucking lice, which feed on the blood. Only sucking lice live on.
Lice need to suck blood to survive, and they sometimes live on people's heads and lay eggs in their hair. Get the lowdown on lice in this article.
The amount of blood drunk by a head louse in a single feeding These are used to cut into a capillary and form a tube to suck out blood.