ALEX HYDE / SCIENCE PHOTO LIBRARY ALEX HYDE / SCIENCE PHOTO LIBRARY
Tiger leech (Haemadipsa picta) feeding on human blood. Leeches attach themselves to the skin using suckers and create a wound with their three sharp jaw plates. Their saliva contains hirudin, a chemical which prevents the blood from clotting. Photographed in Maliau Basin, Sabah, Borneo, Malaysia.
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