Lice suck blood
What do head lice look like? - NIPH
Head louse - Wikipedia
26 Jan 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.
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Description:What are head lice? 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 adult is about the size of a sesame seed.