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Black fly (Simulium sp.) head. Coloured scanning electron micrograph (SEM) of the head of a black fly, showing its large compound eyes (red), anennae (top) and mouthparts (centre-left). Most black flies (family Simuliidae) feed on the blood of mammals, including humans, although the males feed mainly on nectar. Magnification: x60, when printed 10 cm wide.
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