This is a habitat where the edge of the prairie blends into the deciduous forest. In a savanna, several huge spreading trees grow on an acre, with a riot of flowers and grasses thriving beneath them. Savannas once covered many Iowa hilltops, but were one of the first habitats to disappear during settlement, as old oaks were cut for lumber and fuel, and the land was plowed into fields. A good example of an oak-hickory savanna is just north of the Lynne Stimple Prairie off Otis Road.