Vegetation typically includes perennial grasses and herbs. Vegetation ranges from rainforest to savanna grasses. Seeds of wild grasses and other vegetation were also spread. Farmland hosts a variety of semi-natural vegetation of grasses and flowering plants. Bison are largely grazers, eating primarily grasses and sedges. Mosses, ferns, grasses, and fungi grow on the topsoil. Ibex fed on vegetation such as grasses and herbs. Bison are herbivores, grazing on the grasses and sedges of the North American prairies. California's native grasses are perennial plants. It mainly feeds on seeds such as those of weeds, grasses and figs. The lower elevations have a steppe vegetation with a variety of grasses and small bushes. Grasslands are areas where the vegetation is dominated by grasses (Poaceae). They are hemiparasitic on the roots of grasses and forbs. The nest is concealed in grasses or weeds. Elk browsing also increases diversity of grasses and forbs.