One of the most predominant animals at Heron Island is the green sea turtle. When they are born they make a rush to the water where about 10% will be eaten. After getting to the water they must get through the reef where about 75% are eaten. After they make it to the open sea they will spend ten years drifting until they are ten years old and the size of a dinner plate. When they reach that size, they go to a reef where they will spend the next ten years of their life. After those ten years, they go back to the open ocean and will return to the same beach or within 60 kilometers of the beach to lay their eggs. After the females lay their eggs at high tide in the night they will go back to the water and in a short period of time lay another batch of eggs. Each batch of eggs will have about between 150 eggs to 800 eggs. In one breeding season, one female can lay up to six batches of eggs.