The leatherback is the largest sea turtle in the world, measuring as much as 6.5 feet in length and weighing as much as 1190 pounds. Unlike other sea turtles, the leatherback does not have a hard shell, but rather a leathery carapace composed of a mosaic of small bones covered by firm, rubbery skin with seven longitudinal ridges and numerous white spots. The most widely spread marine turtles, leatherbacks are found in the Pacific, Indian and Atlantic Oceans, particularly in tropical regions. They feed on jellyfish and other oceanic invertebrates. Leatherbacks dive the deepest of any sea turtles (almost 4000ft) and migrate thousands of miles across ocean basins. They nest every two to three years, several times in one season, to lay nests of around 80 eggs. Leatherbacks are classified as Vulnerable by the IUCN and in the CITES Appendix I. In the Caribbean costs of NIcaragua, leatherbacks nest in El Cocal in small numbers. Leatherbacks also nest on the Pacific side of the country, in places such as Salamina, Chacocente, Isla Juan Venado and Veracruz de Acayo.