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On Costa Rica's Pacific coast, sea turtles come ashore at night to nest on protected beaches at Las Baulas National Marine Park. This stretch of coastline provides important habitat for green, olive ridley and critically endangered leatherback turtles, and is the focus of one of Earthwatch Expeditions' longest-running research programs. Each nesting season reveals new details about their journeys between land and sea.

Here, scientists study how sea turtles nest, feed and survive across coastal and marine habitats. Eastern Pacific leatherbacks, whose numbers have declined by more than 90% since 1980, remain a vital part of this important long-term research. Join nighttime beach patrols and offshore turtle studies, gathering data that helps researchers protect these remarkable animals and the habitats they depend on.