Leech, coloured scanning electron micrograph (SEM).This parasite has two suckers, one at each end of its body, that it uses to attach itself to the skin of its victim whilst it drinks their blood. The mouth is contained within the head sucker (bottom right) while the rear sucker (upper left) is used to hold the leech on the prey's skin. Magnification: x10 when printed at 10 centimetres wide.