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Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis. The body louse lives in clothing and only moves onto the skin to eat, whereas the head louse is restricted to the hair of the head. Despite this difference in habitat, the two lice differ only slightly in shape and are capable of interbreeding. Head lice glue their eggs (nits) to hairs, while the body louse mainly uses the folds of the seams in clothing. Magnification: x25 when printed 10cm wide.; (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY)