APA Citation Pamphlet, Brochure, or Bulletin Publication Manual of the American Psychological Association, 6th Ed., p.187-192, 6.31-6.32 Pamphlet Harvey, E. (1999). 180 Ways to walk the customer service talk. [Pamphlet].
Although any part of the scalp may be colonized, lice favor the nape of the neck and the area behind the ears, where the eggs are usually laid. Head lice are repelled by light and will move towards shadows or dark-colored objects in their vicinity.
Unless the infestation is heavy, it's more common to see nits in a child's hair than it is to see live lice crawling on the scalp. Lice eggs hatch within 1 to 2 weeks after they're laid. Adult lice and nymphs (baby lice).The adult louse is no bigger than a sesame seed and is grayish-white or tan. Nymphs are smaller and become adult lice about 1 to 2 weeks after they hatch.Most lice feed on blood several times a day, but they can survive up to 2 days off the scalp. Source(s): http://wiki.answers.com/Q/When_do_head_l...nless the infestation is heavy, it's more common to see nits in a child's hair than it is to see live lice crawling on the scalp. Lice eggs hatch within 1 to 2 weeks after they're laid. Adult lice and nymphs (baby lice).