Look inside this sulcata tortoise shell, you'll see the spine and ribs are actually fused right into the shell. If you look closely, you can see the backbone and ribs, all covered by protective dermal plates. | Florida Iguana and Tortoise Breeders

658K 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