Chelonia is a genus that includes sea turtles, most notably the green sea turtle (Chelonia mydas). These turtles are commonly found in tropical and subtropical oceans around the world. They prefer coastal areas with seagrass beds or coral reefs, where they forage for food. Common characteristics of this genus include a streamlined, large shell, flipper-like limbs for swimming, and the ability to migrate long distances between feeding and nesting grounds. One interesting fact is that green sea turtles can live for over 80 years, and they play a crucial role in maintaining healthy marine ecosystems by grazing on seagrass, which helps keep seagrass beds productive.