Lepidochelys olivacea, Cheloniidae, olive ridley sea turtle, marine reptiles, sea turtles, behavior, arribada (mass nesting), eggs, environmental issues, sustainable explotation of resources, trade, Ostional Wildlife Refuge, Guanacaste, Costa Rica, Pacific Ocean.

Remarks: The collection of eggs is a legal sustainable activity, and is supported by scientists and environmentalists. Sea turtles lay up to 100 millions eggs per month; less than 0.5 percent of eggs are collected. Often last sea turtles destroy the nest of the first turtles. The profits of the sale of eggs, through the ADIO (Spanish acronym of the Association for the Integral Development of Ostional), are aimed at improving the lives of the locals who participate in the conservation of the olive ridley turtle.