Loggerhead Key existed on the island in the early 1900s. Fauna of Loggerhead Key includes sea turtles, which are monitored by park rangers with the Dry Tortugas National Park to document nesting and hatching rates. The loggerhead sea turtle is also present on the island. In August 2016, a National Park marine biologist stated that 113 loggerhead turtle nests existed on the island at that time. This was the highest recorded nest rate compared previous years. The island also has brown pelicans. In 1972, hundreds of rhesus macaque monkeys were brought from India to Loggerhead Key by Charles River Laboratories. This was
USS Loggerhead (SS-374) these islands, the enemy shore batteries surprised her with hot fire. Evading the bursts of the Japanese shells through skillful maneuvers, "Loggerhead" escaped undamaged. She arrived at Fremantle on 19 July. The end of hostilities on 15 August found "Loggerhead" two days out of Fremantle heading for the Gulf of Siam on her second war patrol. She put in Subic Bay on 22 August, departed for the United States 31 August via Pearl Harbor, and arrived at San Francisco 22 September 1945. "Loggerhead" was decommissioned at Mare Island Navy Yard 16 June 1946 and was placed in the Pacific Reserve