Ostional leatherback Turtle
At Ostional you have the chance to witness an amazing natural phenomena called an ARRIBADA (arrival). An arribada is the time the sea turtles come to lay their eggs in staggering numbers for 2-4 days. A few hundred turtles, if not thousands, have been known to appear out of the depths of the sea to make their nests in the sand.
The best time to visit Ostional is just before and during an arribada. These occur, as a general rule (not always), at the start of the last Quarter moon. At first, a few hundred turtles will come out on the beach followed by a steady stream of sea turtles for the next three days.