Culebra [1] is one of three nesting grounds for hawksbill and leatherback turtles, the latter of which is the largest species of turtle in the world, weighing between 500 and 1,600 pounds. From April to early June, the sea turtles spend the evenings trudging up the beach at Playa Resaca and Playa Brava to dig holes and lay eggs before returning to the sea in grand displays of sand-tossing to cover their tracks.
The Puerto Rico Department of Natural and Environmental Resources (787/556-6234 or 877/77-CORAL—877/772-6725, fax 530/618-4605, info [at] coralations [dot] org, www.coralations.org/turtles [2]) accepts volunteers to catalog the turtles when they nest.
Links:
[1] http://www.moon.com/destinations/puerto-rico/vieques-and-culebra/culebra
[2] http://www.coralations.org/turtles