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
Loggerhead kingbird visible in the field. The tail is squared and ends with a buffy-white band. It feeds on flying insects, small fruit and berries, and small lizards. Loggerhead kingbird The loggerhead kingbird ("Tyrannus caudifasciatus") is a species of bird in the family Tyrannidae. It is found in the Bahamas, Cayman Islands, Cuba, the Dominican Republic, Haiti, Jamaica, Puerto Rico, and, very rarely, in the United States. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. This large kingbird measures long. It is dark grey above and white below. The head is black while