Small white lady's slipper orchid - Endangered because of habitat destruction. Used to be very common on the prairies of southern and western Minnesota but has declined due to land being used for farming (H in HIPPCO).
Black-Footed Ferret - Only ferret native to North America. Found from northern Mexico to southern Canada. Almost brought to extinction due to Habitat destruction (H in HIPPCO) and disease.
American Bison - The symbolic animal of the Great Plains and the national mammal of the US. They graze on the abundance of grass in the Great Plains. Bison also have thick coats for the winter.
Grey Wolf - They are endangered but have been reintroduced into Yellowstone National Park. They help control herbivore populations which helps the whole entire ecosystem.
Prairie Dog - Live in underground burrows to protect themselves from predators. They also have complex communication systems to warn each other about threats.
Buffalo Grass - Very drought resistant. Important food source for livestock, deer, buffalo, and prairie dogs. The seeds have burrs that stick to animals and fall off relatively close to the parent plant.
Blue Grama Grass - Has dense, shallow roots which hold the soil together. It can stand drought, heat, and cold.
Butterfly Milkweed - The seeds have long silky hair which allows the wind to scatter the seeds. It attracts butterflies which pollinate it and other plants.