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Cyanide is one of the best known of all poisons. Perhaps best known as the suicide pills reputedly carried by secret agents it was also the active ingredient in the gas (Zyklon B) used by the Nazis in extermination camps such as Auschwitz.
The poison affects the nervous system and muscles, causing paralysis and eventual respiratory failure. It is potent enough to immobilize an animal as large as a monkey. Some species of poison dart frogs have poisons that are more toxic than others, but a few have no toxins at all.