The Olive Ridley Sea Turtles of Ostional National Wildlife Refuge in Costa Rica are world famous for their arribadas, huge egg laying seasons. The nesting beach at Ostional can be covered with thousands of turtles during an arribada. Although some believe that arribadas may be correlated with moon phases and tides, there are turtles laying eggs at Ostional Beach throughout most of the year.
The largest "arribada" thus far recorded in Ostional, took place in November 1995 when a calculated 500 000 females came ashore.
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