Grasslands include pampas, steppes, and prairies. American bison live in river valleys, and on prairies and plains. The preferred habitat of the maned wolf includes grasslands, scrub prairies, and forests. Most are herbaceous perennial species found in open areas such as meadows, prairies, and savannas. The Lakota crossed the river into the drier, short-grass prairies of the High Plains. Its habitats include dry open woods, prairies and barrens. In the treeless prairies homesteaders built sod houses. The Canadian portion of the Plains is known as the Canadian Prairies. Bison are herbivores, grazing on the grasses and sedges of the North American prairies. The flower occurs in prairies, pastures, and disturbed fields. More than half of the remaining native grassland in the Canadian prairies is mixed. The campuses are located on of forests, prairies, and lakes. The county terrain consists of rolling prairies and bottom lands. The Carlton Trail became a land route across the prairies. Alligators have created a niche in wet prairies.