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Turtles usually lay their eggs between November and March.
The females come ashore after dusk, but they have been observed nesting until just before dawn. They select their nesting site and dig a small pit 18 inches deep using their rear flippers.
A clutch of between 40 to 180 eggs will be laid, after which the pit will be carefully concealed by sand before they return to the sea. The whole process usually takes about one hour.
During the egg laying, the eyes of the turtle will be covered by a colourless mucus to prevent dehydration and keep out the sand grains.
After an incubation period of 60 days, the hatchlings dig their way up to the surface of the pit, usually at night when the sand is cooler.
Hatchlings locate the water's edge by orienting themselves to the horizon, but distant house lights can disorient the youngsters so that they actually crawl away from the sea.
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The best diving areas to see turtles are the Similan and Surin Islands National Parks, visited by liveaboards from Phuket.
Turtles are most commonly seen in shallow reefs on dive sites such as East of Eden (Ko Payu, Similans) or Ko Torinla (Surin), but you may see them deeper on rocky sites such as Elephant Head Rock or Deep Six (Ko Payu, Similans). The usual sightings are Hawksbill and Green turtles.
At Thai Muang (National Park), north of Phuket, Leatherback and Olive Ridley are the two main species of nesting turtles. There is an annual 7 day event here, usually during the first week of March, to release young turtle hatchlings, which have been raised by the Fisheries Deptartment, back into the sea.
This is designed to heighten people's awareness of the declining numbers of nesting females and promote conservation efforts.
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