In Costa Rica, on Ostional beach, 350 kilometers northwest of San Jose, there is an exceptional date. If they give it every month thousands of turtles to lay their eggs (a hundred each) on the black sand. The arribada (as this spectacular landing is called) coincides with the third quarter and the full moon, especially in the months between July and September.

There are so many that the nests built by the first ones are often destroyed by successive waves. The large number of eggs laid allows it to be harvested by the local population during the first 36 hours (the only place in the world where it happens): those collections still represent only one percent of the total.

The largest arribada ever recorded was that of 1995, when about 500 thousand turtle females landed on the beach.