The predominant focus of the 24 Outdoor Biology Instructional Strategies (OBIS) Trial Edition Set III activities is on animal behavior, and the adaptations and diversity of both plants and animals. Night time activities, games, investigation, experimentation, and crafts are used to study ants, birds, clams, water snails, water striders, spiders, lizards, pillbugs, sow bugs, jays, and plants. The holding adaptations of water organisms, response of animals to varying light conditions, stalking, food preferences, and pigmentation are also investigated. The activities, organized in 24 separate, water-resistant folios, include introduction, preparation, materials, actions, follow up, and related activities. There are 3 additional folios. An "OBIS Tool Box" provides information for construction and use of simple equipment, such as a clam hoop, lizard rig, night shine flashlight, and sweep net, and explains game variations and craft methods. There is an order form for hard-to-locate materials. A "Survival Kit" for leaders contains sample combinations of activities from Sets I, II, and III to organize concept packages and skill units, as well as tips on safety, conservation, and site selection. "What is OBIS?" explains some major biological and environmental concepts embraced by the activities. (SB)