Mature female Olive ridley sea turtle (Lepidochelys olivacea) arrives at the beach of Ostional, Costa Rica, Pacific coast, November, at the beginning of the arribada (mass nesting event) of the sea turtles. ^^^ Thousands and thousands of the 50 kilogram reptiles come ashore over a period of up to a week, only interrupted by the hottest midday sun, to bury their eggs in the warm sand.