Natural history of Trinidad and Tobago giant leatherback sea turtle ("Dermochelys coriacea"), the hawksbill turtle ("Eretmochelys imbricata"), the loggerhead turtle ("Caretta caretta"), the olive ridley turtle ("Lepidochelys olivacea") and the green sea turtle ("Chelonia mydas") are marine species that either nest on the islands' beaches or frequent their coastal waters. The land dwelling yellow-footed tortoise ("Geochelone denticulata") or Morrocoy as it is locally known is threatened by high levels of poaching in Trinidad. The odd mata-mata turtle ("Chelus fimbriata") is known as a waif (and is possibly a rare inhabitant) of the Nariva Swamp and other southern and eastern coastal river systems in Trinidad. The wood-turtle
Loggerhead Key performed some of the first research on Western hemisphere mangroves and coral reefs, marine life at the Loggerhead Key coral reefs, other marine life, and also performed underwater color and black-and-white photography there. Due to safety concerns regarding the hurricane season, research only occurred in the late spring and summer months. Loggerhead Key Loggerhead Key is an uninhabited tropical island within the Dry Tortugas group of islands inside the Gulf of Mexico. At approximately 49 acres (19.8 hectares) in size, it is the largest island of the Dry Tortugas. Despite being uninhabited, the island receives visitors, such as day visitors