 The portion of the island south of U.S. Route 1 is protected as the Ohio Key National Wildlife Refuge.It was once known as Little Duck Key, however the name Little Duck Key is currently used for a very small island about a mile (1.6 km) to the east that is the western terminus of the Seven Mile Bridge.The oceanside area of Ohio Key has palm trees, buttonwood trees and mangrove trees, and bird watching occurs there.