@natures.secret6: The sand looked empty. It wasn't. 🌊 The Southern Stingray can grow to the width of a dining table — and disappear beneath the sand in under three seconds. It has no bones. None. Its entire body is cartilage. And buried completely under the seafloor, it can still detect the electrical pulse of your heartbeat from a metre away. It's been doing this for 100 million years. It was here before we ever walked into the water. 🐟