The Golden Bamboo Lemur (Hapalemur aureus) is a medium-sized bamboo lemur endemic to south-eastern Madagascar. As its name indicates, this lemur feeds almost exclusively on grasses, especially the giant bamboo or Cathariostachys madagascariensis. The growing shoots of this bamboo contain 1 part in 6667 of cyanide. Each adult lemur eats about 18 oz of bamboo per day, which contain about twelve times the lethal dose of cyanide for most other animals of this size. They live in small groups of two t