From Creatures Wikia
Cyanide is a chemical that when present in a Creature's body causes the heart to stop beating, and may be fatal if a cure is not administered in time. It is found in Creatures 2, Creatures 3, and Docking Station.
Cyanide can be found mainly in toxic plants, such as certain kinds of berries. It is cured by injecting Sodium thiosulphate.
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