Yep, you read that correctly – Llama poop. New World peoples did not domesticate large beasts of burden with one exception – the Llama in South America. The Inca used Llamas as pack animals, as a source of hair for knitting & weaving, nutrients, companionship, and even their dung was instrumental. Like most civilizations, the dung of large animals was used for fertilization and burned as a fuel source.
Read more about the role of the Llama in Incan Civilization in this Discovery News Article.