The green sea turtle is a globally endangered species and one of the most important nesting grounds for it is in Tortuguero, Costa Rica - the word Totuguero is derived from old Spanish maps meaning "place of turtles". After a steady global decline in its population due to overhunting for its meat and eggs, the Tortuguero National Park was established in 1975 in an effort to protect and save the turtle's breeding zone. A highly cited study by Tröeng and Rankin, investigated in 2004, the effects that this protective measure has had on the nesting trend. Although the population of turtles shows a large inter-annual variation thus making the task of determining the exact number very difficult, on an average, the trend has been positive over a long time scale of almost 35 years. The study illustrated that the enactment of three laws by the Costa Rican government was vital in stabilizing and increasing the population of these green sea turtles.