Two films are suggested as initiating activities, but you would have to locate them. Nevertheless, there is plenty of material here to provide your biology or ecology classes with a complete mini-unit on freshwater fish species in the Great Lakes system. They examine the biological classification system, use dichotomous keys, and learn anatomical features of fish. Five drawings of unknown fish are given to learners to identify. After the guided practice, learners create their own dichotomous keys. You don't have to necessarily be studying fish to make use of this resource; it is a support for any curriculum on adaptations, biodiversity, or classification.