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.

A bizarre result of this is that frogs raised in captivity and deprived of their normal diet grow up to be completely harmless. The insect eaten by the most poisonous frog, the golden poison dart frog (Phylobates terribilis), is still a mystery, though is thought to be a type of beetle.