Beauty is full of death. At least in nature, the most colourful and striking creatures tend to be the most lethal. We see it in the poison dart frog, the pitohui bird and several species of snakes. Plants are no exception. They have developed their lethal capacity in response to their environments, either as a defensive feature or an offensive one as hunters. The bottom line is survival, and they do it in subtle, fascinating and evil ways. In a world centred on survival, the law of the land is eat or be eaten. Here are some of the deadliest plants in the world.