Swan Lake is the largest body of water at the zoo, giving a home to native waterfowl of Cincinnati. Many species like mallards, pintails, and swans are free to inhabit the lake as they please as the historic train also circles around them. Along the end of the lake is "Crane Island", home to a Japanese species called red-crowned cranes. "Wetland Trails" is an area, giving an all natural, naturally enclosed habitat to a sandhill crane.