Three-Hearted, Blue-Blooded Marvel of the Ocean

Did you know that octopuses have three hearts and blue blood? Two hearts pump blood to their gills, while the third circulates it through the body—but when they swim, that main heart stops beating to save energy! Their blue blood comes from hemocyanin, a copper-rich molecule that helps them survive in cold, low-oxygen waters. Nature’s engineering at its finest! 🐙💙