The snakelocks anemone (Anemonia viridis) is a sea anemone found in the eastern Atlantic Ocean to the Mediterranean Sea. The tentacles of anemones in deep or murky water can be a grey colour, but are otherwise usually a deep green colour with purple tips due to the presence of symbiotic algae within the tentacles that use sunlight as an energy source. As a result, the anemones prefer brightly lit shallow waters. On average the snakelock anemone is 8 cm wide.