Sea turtles have temperature-dependent sex determination, meaning the developing turtle's sex depends on the temperature it is exposed to. Warmer temperatures produce female hatchlings, while cooler temperatures produce male hatchlings. The eggs will incubate for 50–60 days. The eggs in one nest hatch together over a short period of time. The baby turtles break free of the egg shell, dig through the sand, and crawl into the sea. Most species of sea turtles hatch at night. However, the Kemp's ridley commonly hatches during the day. Turtle nests that hatch during the day are more vulnerable to predators, and may encounter more human activity on beach.