The very mention of these insects can make a person start scratching. Lice and fleas prey on humans and animals and can make our lives pretty lousy. These blood-sucking parasites are ectoparasites because they feed outside the body of their hosts. They have become the subject of many stories, poems, books, and events. Learn the history of these insects, how people have been battling them since the beginning of time, and why these pests cannot live without us. Attention grabbing titles such as, Cooties, Flea Bags, and Nitpicking, will entice even the most reluctant of readers.