American crocodile
The Keys are also home to unique animal species, including the American crocodile, Key deer (protected by the National Key Deer Refuge), and the Key Largo woodrat. The Keys is part of the northernmost range of the American crocodile, which is found throughout the Neotropics. The Key Largo Woodrat is found only in the northern part of its namesake island, and is a focus of management activities in Crocodile Lake National Wildlife Refuge. About 70 miles (110 km) west of Key West is Dry Tortugas National Park.