Sea turtles are among the animals divers most hope to encounter in tropical water. Around Koh Tao, a turtle moving calmly across the reef can turn an ordinary dive into a memorable one, but the encounter is never something that should be forced or guaranteed. How to recognise a green sea turtle Identification can be difficult for a new diver. Green turtles typically have a relatively smooth, rounded shell and a smaller head in proportion to some other sea turtle species. Experienced observers use a combination of shell shape, head shape and scale patterns. Why are they called green turtles? The name does not simply describe a bright green shell. It historically refers to the colour associated with body fat. Adult green turtles are notable among sea turtles for feeding heavily on seagrasses and algae, although diet varies with life stage and habitat. Where might divers see turtles? Turtles may be encountered around reef habitats where food, shelter and suitable resting areas are available. Individual sightings vary, and there is no dive site where a wild turtle should be promised. Phoenix Divers’ Koh Tao dive-site guide helps divers understand the different local habitats. Give resting turtles space A turtle resting on the reef should not be surrounded. Maintain a respectful distance, stay neutrally buoyant and leave a clear route for the animal to swim away. Never block a turtle at the surface Sea turtles breathe air. If one begins moving toward the surface, divers should not place themselves above it or try to keep the animal underwater for a longer encounter. Do not chase turtles If a turtle increases speed or repeatedly changes course away from divers, stop pursuing it. The best wildlife encounters happen when the animal remains relaxed enough to behave naturally. Photography should not change the encounter Before moving closer for a photo, check your buoyancy and surroundings. If the photograph requires you to disturb the animal, it is not worth taking. Green turtles and conservation Green sea turtles face threats across their range, including habitat loss, accidental capture, marine debris and other human pressures. NOAA Fisheries provides an overview of green turtle biology and conservation. What divers can do Keep a respectful distance. Never touch or feed turtles. Do not block their route to the surface. Maintain good buoyancy around reef habitat. Follow local wildlife rules. Enjoy the encounter without controlling it Certified divers can explore local habitats through Phoenix Divers’ fun diving in Koh Tao. Also read the guide to observing marine life responsibly.