[[Image:Sucking Louse.jpg|thumb|right|150px|Sucking Louse ''Pediculosis humanus'' <br> Smith VS et al. 2004, WikiMedia Commons]]
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Also known as '''sucking lice'''.
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They have a narrow head, and the thorax wider than the head. They have powerful legs, and piercing mouthparts, used to feed on blood and tissue fluids. Heavy infestations can cause anaemia.