This guide is intended to provide stimuli for discussion and review of ecological principles and their relevance to daily human existence. The illustrations, purposefully detailed and complex, are intended to provide a basis for in-depth discussion. The bulletin is intended to supplement classroom materials and also to serve non-classroom situations involving environmental education such as Scouting and Youth Conservation Corps. The book is a summary of ecological concepts presented as a game in which organisms interact with each other and their non-living environment. (Author/RE)