Wildlife viewing is the single most popular recreational use of the refuge. The refuge hosts plants and animals that have nearly vanished from the state. It contains two State Natural Areas and harbors the world’s largest population of endangered Karner blue butterflies. The refuge boasts the most abundant red-headed woodpecker population in the state and is home to whooping cranes. Necedah is designated as an Important Bird Area. Drive, hike or paddle different parts of the refuge to see the diversity that lives here.