Explanations of a marine mammal rescue program and information on seals and sea lions are presented in this curriculum package for intermediate grade teachers. Activities are highlighted which focus on the natural history of harbor seals. This unit contains: (1) pre-trip activities (including fact sheets and worksheets on the different types of seals, a vocabulary list, and a description of the differences between seals and sea lions); (2) trip activities (offering suggestions for successful field trips, a floor plan of the aquarium, and observation recording sheets for use at the aquarium's Seal Pool); and (3) post-trip activities (providing an explanation of the New England Aquarium's research and seal rescue programs). A bibliographic listing of publications and an evaluation checklist for teachers are also included. (ML)