Sea turtles can be found in tropical and subtropical waters around the world. There are seven different species of sea turtles, which include the green sea turtle, hawksbill sea turtle, loggerhead sea turtle, Kemp's ridley sea turtle, olive ridley sea turtle, leatherback sea turtle, and flatback sea turtle. All sea turtles spend most of their lives in the ocean but females return to land to lay their eggs in the sand.