Like other reptiles, turtles are cold blooded. In some species of turtle the temperature determines if the egg will develop into a male or female, lower temperatures lead to a male while higher temperatures lead to a female. Some turtles lay eggs in the sand and leave them to hatch on their own. The young turtles make their way to the top of the sand and scramble to the water while trying to avoid predators. Sea turtles have special glands which help remove salt from the water they drink.
Source: ScienceKids