STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Dog flea. Coloured scanning electron micrograph (SEM) of a dog flea (Ctenocephalides canis). Combs, known as ctenidia, on the flea's head help to anchor it to its host's fur. Piercing mouthparts (centre) enable the flea to pierce the skin to feed on the dog's blood. Its powerful legs are adapted for jumping. Fleas only remain on their hosts whilst feeding.
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