It is a biome that is characterized by presenting a single stratum of vegetation. The number of species is very large, but represented by small number of individuals of each species.

The location of the fields is very varied: Midwest United States, Mideast Eurasia, part of South America (Brazil, Argentina) and Australia.

During the day the temperature is high, but at night the temperature is very low. Lots of light and wind, little humidity. The grasses predominate. Animals, depending on the region, can be: American antelopes and bison, rodents, many insects, hawks, owls, etc.