Much has changed since William Henry Harrison first came to this area, when ninety-five percent of Ohio was covered in forest, compared with less than thirty percent today. Buffalo once roamed these lands, but hunters arriving from the east killed whole herds for meat, fur, and horns, and other plant and animal species suffered from the buffalo's loss. Even so, glimpses of that earlier landscape remain here, where portions of the site have been returned to their natural state in accordance with the United States Fish and Wildlife Service's natural preservation strategy. Though the buffalo are gone, the endangered Running Buffalo Clover can still be found in the Lawn of Congress Green Cemetery in sporadic clumps, and the nature trail to Harrison's Tomb passes through a remnant forest, a descendant of the forests that young Ensign Harrison marched through in the early days of his military career.