The Olive Ridley Sea Turtle has one of the most incredible nesting habits in the natural world. Large groups of the turtles will gather offshore of the nesting beaches, and all at once, hundreds of thousands of the turtles will swim ashore to nest. In some cases, the densities of nesting females may be so high that previously laid clutches of eggs can be dug up by other females excavating their own nest. This phenomena is known as “arribada” which is Spanish for arrival. Arribada nesting behaviour is only know to the genus Lepidochelys which includes the Olive Ridley Sea Turtle and the Kemp’s Ridley Sea Turtle. Other sea turtles will nest in groups, but no other species have been observed nesting in such large congregations or with such precise synchrony. Solitary nesting is also common for the Olive Ridley Sea Turtle and has been recorded in over 40 countries across the world, but arribada nesting has only been recorded on a handful of beaches in the world. Female Olive Ridley Sea Turtles nest every year, and up to 3 times per season, laying clutches of up to 100 eggs. Like Green Sea Turtles, the sex of the hatchlings is determined by the nest temperature. Immediately after hatching, juveniles make their way to the sea.