The gender of adult green sea turtles is easy to identify, and the length of the tail is a gender characteristic. In general, male green turtles have much longer tails than females. Mature green sea turtles swim in the ocean all year round, but during the breeding season, even if they are thousands of miles away, before the spawning season, male and female turtles will migrate from their foraging habitats to the place of birth, on the coast. , in the surrounding waters of the island or on land.

Research shows that green sea turtles do not migrate until about 2 to 9 years on average. The length of mating and egg-laying interval will be affected by environmental factors such as climate, food, temperature, etc. The physiological condition of the female green sea turtle will also affect her reproductive cycle; therefore, the number of female turtles that come ashore to lay eggs varies greatly each year , without a certain periodicity.