https://www.bbc.co.uk/cbbc/watch/extraordinary-animals-with-real-superpowers

You wouldn’t want to touch a poison dart frog – they secrete toxins through their skin. Their bright colouring advertises their toxicity to potential predators like a neon sign: “Stay away!” Ingestion of these poisons can cause breathing problems, coma or even death, just like Rogue’s touch.