National Key Deer Refuge protects 8,542 acres on Big Pine Key and nearby No Name Key in the Florida Keys. Established to preserve the endangered Key deer, a small white-tailed deer subspecies found only in the Keys, it contains upland forests, wetlands, and marshes, including 2,278 acres designated as wilderness. The refuge's best-known resident numbers around 800 animals, and the area also supports 21 other threatened and endangered plant and animal species. Beyond its own lands, the refuge also administers Crocodile Lake National Wildlife Refuge, Great White Heron National Wildlife Refuge, and Key West National Wildlife Refuge.