Description With hard shells that protect them from predators, turtles are among the oldest group of reptiles. Readers will discover that sea turtles rarely leave the water except to lay eggs in the sand. They will read about freshwater turtles that love to soak up the sun on logs or rocks. What most people don't know is that the temperature of the turtle's nest determines whether the babies are male or female. Interesting facts and stunning photographs are sure to open the door for discussions about habitat, predators, and various other science-related topics.