For most animals, their colouring is not an aesthetic choice, but a matter of life and death. The ability to evade the wary eyes of a predator by blending into the surrounding environment has arisen again and again within the animal kingdom – and with some necessity. But there are some critters that blatantly waive this rule, and though they look good enough to eat, some of them can kill you with a single touch. These are the famous poison arrow frogs of South and Central America.