Reptiles are cold-blooded, air-breathing vertebrates (have lungs) with a bony skeleton and a body usually covered with scales or horny plates. Reptile reproduction lacks a larval stage (are usually egg-laying) and includes turtles, snakes, crocodiles and lizards.
Reptiles typically have 4 legs, except snakes, which are descended from four-limbed ancestors.
Aquatic reptiles found at dive sites around Koh Lanta include sea turtles and coral reef snakes (venomous snakes) of which only a few distinct members are normally encountered.
There are 5 sea turtle species found in Thai waters: Leatherback, Olive Ridley, Loggerhead, Green and Hawksbill. All species of sea turtles are protected under the Thai Wildlife Protection Act of 1992, and some, such as the Hawksbill Turtle are a critically endangered species.