英语听力：自然百科 虫虫兄弟—4（在线收听）

Next door, Josh is the only one seemed to his business. All he feels is an itch, but invisible to the naked eye, a mite has get to go, too. Bloated with human skin, one mite can defecate about 20 pellets every day.And judging by the state of Danny's hair, she's having a louse start to her day. It's a life with head lice. It's a myth that head lice like dirty hair. Clean hair is less likely to be greasy and easier to move around, and long hair provides more places to hang on to. Head lice have six grasping legs, each with a cl* to help them stick to the hair shafts. There are usually fewer than a dozen lice on an infected head, but they can be a mountain of litter. The discarded shells hunderds of eggs. Female lice can survive on the same skull for nearly a month and lay up to 60 eggs. And once one member of a household has lice, without treatment, everyone is at risk of invasion. These lice punch skin to feed at least once a day, draining blood for its nutrients, and inject s* to stop clotting. A young lice's transparent body takes on the family colors after its first meal.