Sea turtles‌ (Superfamily Chelonioidea) are turtles found in all the world's oceans except the Arctic Ocean. There are seven living species of sea turtles: flatback, green, hawksbill, Kemp's Ridley, leatherback, loggerhead, and olive ridley. All but the leatherback are in the family Cheloniidae; the leatherback belongs to the family Dermochelyidae and is its only member. The Flatback turtle is found solely on the northern coast of Australia‌.

Sea turtles have roamed the oceans for at least 150 million years, making them one of the oldest surviving animals on Earth. They are reptiles and cold-blooded, with scaly skin, breathe air, and have a heart with three chambers‌.

Sea turtles spend most of their time in the sea, but they come ashore to lay eggs. Female sea turtles come to beaches in Florida to lay their eggs, and then return to the ocean. However, the number of some of these turtle species is falling due to various threats such as habitat destruction and egg poaching. To protect them, people in Florida work together through organizations like the Sea Turtle Conservancy. One law passed by the Florida government is the "Florida's Marine Turtle Protection Act," which prevents anyone from destroying sea turtle nests or eggs‌.