Sea turtles are well oriented in the Earth’s magnetic field. They can return to their birthplace after many years.
Many thousands of olive sea turtles gather for mating in one day at some beach and almost simultaneously lay millions of eggs. For this purpose, the female is looking for a suitable place on the beach and begins to shovel the sand with her hind legs until a circular excavation of 40-50 cm deep is formed. The female lays her eggs and falls asleep in the sand. In order to hide the masonry from predators, she gently tamps the sand, making the masonry as discreet as possible. The whole process takes about an hour. Having fulfilled its mission to continue the family, the massive turtle returns to the ocean and no longer takes care of its offspring.
It takes about two months for the cubs to develop inside the eggs and depends directly on the temperature of the sand in which the clutch is buried. The future sex of turtles also depends on temperature: males develop at lower temperature, females – at higher … . If the temperature is much higher or lower than necessary, the cubs die. Those little turtles that are lucky enough to survive, pierce the shell and get out into the air through the thickness of the sand. Already at this stage, the mortality rate among hatched calves is extremely high. However, most of the turtles that have made it out of the sand will never reach the ocean, as most of them will be eaten by land predators and the rest will be waited for by marine predators.
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