Containing almost 30,000 acres of estuarine habitat, uplands, open water, mudflats, salt ponds, and salt marshes, including much of southern San Francisco Bay, Don Edwards San Francisco Bay National Wildlife Refuge provides habitat for many wildlife. Its purpose is to protect wildlife habitat for endangered species and migratory birds, and to offer opportunities for nature study. The Visitor Center and Nature Store in Fremont, is open on Saturdays from 10 AM to 2 PM.Don Edwards San Francisco Bay National Wildlife Refugeis part of the San Francisco Bay National Wildlife Refuge Complex and is administered by the US Fish & Wildlife Service. TheSan Francisco Bay Wildlife Societyis a not-for-profit 501(c)(3) Friends group supporting the education, interpretation, and research activities of San Francisco Bay National Wildlife Refuges.