Five of the seven species of sea turtles that cruise the world's oceans come to Costa Rica to lay their eggs. From July to October each year, hordes of Green sea turtles flood the Caribbean coast near Tortuguero National Park. Other endangered species are known to inhabit the area when the green sea turtle is away. These include the loggerhead, the hawksbill, and the world's largest reptile, the giant leather-back. The latter, which can weigh as much a ton and grow to about ten feet long, can be found in greater numbers on the Pacific coast. From October to April, hundreds of leatherbacks come ashore at Playa Grande in Nicoya.