Discusses the bison and its relationship to the Great Plains ecosystem.

Examines the deserts of the Southwest, their ecosystems, and their responses to temperature and weather.

Describes the formation of the Great Lakes, the varied lifeforms that are part of this ecosystem, the interactions among the plants and animals that live there, and threats to this environment.

Examines the prairies of central North America, their ecosystems, and their responses to temperature, weather, and agriculture.

Provides an overview of the rain forests of the world and describes the rain forests of the Pacific Northwest and the life that they support.