This is a link to and episode of the The Nature of Things featuring parasites that manipulate their hosts. This is a great resource for undergraduate parasitology AND intro bio courses. I have used it for both. I show the entire episode in my Animal Parasitology course along with questions for the students to answer in groups at different time intervals throughout. Then they submit their answers as a group. In General Biology I show a 10 minute clip when I introduce parasitism as a life history strategy in the Community Ecology Chapter.