Figure 23.22 The Greater Yellowstone Ecosystem. To better preserve the species in the region, Yellowstone National Park and the many different types of land surrounding it are collectively managed as one large ecosystem.

Photos by Luis Castaneda/age fotostock (Grand Prismatic Spring); SuperStock/age fotostock (Yellowstone bison herd); James Steinberg/Science Source (Old Faithful Geyser); and James Kay/DanitaDelimont.com (Grand Teton Range).