Prepared specifically for use in one-week outdoor summer camp programs for migrant children aged 10-15, the twenty bilingual (Spanish and English) educational and recreational activities in the Outdoor Biology Instructional Strategies (OBIS)/Mini-Corps package have been revised to develop language skills as well as an awareness of the outdoor environment. Simulation, observation, experimentation, and numerous games are used to study ants, fish, lichen, plant habitats and distribution, decomposers, water organisms, stalking, and food chains. Each activity is presented in an individual water-resistant folio containing an introduction, materials list, preparation, action, and language development section consisting of discussion activities, language games, and an all-Spanish mini-dictionary. Throughout the package instructions and information for the leader are in English. Headings, key words, materials, and instructions for students are bilingual. The package contains three additional folios which explain fundamental OBIS activity concepts, describe how to use the materials and activities, and give directions for the construction of simple equipment such as dip nets and aquatic observation chambers. Two booklets aid identification of organisms found in and around lawns and ponds. A Spanish version of the same package is also available. (SB)