A premier nature location, the St. Marks National Wildlife Refuge, encompasses 68,000 acres of protected habitats and ecosystems, providing an incredible opportunity for exceptional views of birds and wildlife. The north-south migratory bird flyway passes through the Refuge. There are numerous nature trails, some with wildlife observation decks. Butterfly viewing is excellent, especially during September and October when Monarch butterflies congregate here on their fall migration to Mexico. American Alligators, Bobcats, Northern River Otters, and Florida Black Bears all make their home here. The Refuge is winter home to endangered Whooping Cranes introduced through Operation Migration. In the Spring you can view the eagles and osprey nesting. Visit the historic St. Marks Lighthouse located at the end of the Refuge road. Stop by the Visitor Center where maps and loaner optics are available.