Female sea turtles return to nest on the same beach, or beaches nearby, on which they hatched. It is thought they use a combination of clues such as ‘reading’ the Earth’s magnetic field and ocean currents and even judging the angle of the sun. Hatchling gender is dependent on sand temperature, cooler sands produce more males, warmer sands produce more females. Although much is known of their activities when they come ashore to nest, little is known of their ocean antics.