Turtle embryos may influence their own biological sex by moving around inside their egg before they hatch.<br />Certain reptiles have evolved such that the temperature in the nest determines the sex of the offspring.<br />Experiments have already shown that these embryos can move around inside of their eggs.<br />But the scientists hoped to measure whether the temperature gradients in the eggs.<br />The researchers changed the temperatures inside the egg by applying heat to just one side. <br />
