657K views · 10K reactions | Depending on the nutrient content of the water in which various turtles live, including sea turtles, they’re known to grow algae on their shells! This is particularly common in musk turtles in springs that have high nitrates, due to the excess nutrient content and lack of basking from the species. To see it on sea turtles is less common, but still very interesting! | DanTheTurtleMan | Facebook