This creature is real but, sadly, it's not a dragon. In fact, it's not even a reptile. This is the Glaucus atlanticis, more commonly known as the blue sea slug. Though it can't fly like a dragon, it can float upside down on the tension of the ocean surface.
Another amazing fact about the blue sea slug? It only gets up to 3 centimeters in size! Here's a picture to give you a visual of just how tiny this creature is.
Though tiny, the blue sea slug feeds on organisms much larger than itself, including the venomous Portuguese Man 'O War. The blue sea slug is immune to the Man 'O War's venom and actually stores it for use against predators.
