安达曼海海底珊瑚礁上，一只绿海龟在海藻丛中游动

of turtle weed (Chlorodesmis fastigiata) grows on the reef wall its toxic chemical defences deter most herbivorous reef fish and sea urchins, so typical grazers avoid feeding on it even while foraging nearby. This lack of grazing pressure allows an established patch to persist largely undisturbed once it takes hold. The algae is however consumed by Green Sea Turtles. 4K, wide angle, vertical, medium shot, scuba diver POV. Andaman Sea, Krabi Province, Thailand.