Tenacious and confounding, the horseshoe crab pre-dates dinosaurs and has copper-based blood vital to vaccine safety They pre-date dinosaurs, eat food using their legs and contain blue blood that we use to keep us healthy. Horseshoe crabs are the supreme, if offbeat, survivors of the invertebrat...
Source: [Guardian International](https://www.theguardian.com/environment/2026/aug/11/horseshoe-crab-invertebrate-of-the-year-2026)