Guano

Title: Guano
Additional Names: Bird manure
Literature References: The dried excrements of sea birds (cormorants) and bats from coastal islands of Peru, Chile, West Indies, and Africa. Usually mixed with feathers and bones. Contains about 9% nitrogen, 6% phosphorus, 2% potassium, and 15-20% moisture. Used as fertilizer.
Guanochlor Guanosine Guanoxabenz Guanoxan Guar Gum

The nest of the Peruvian Booby is made of almost pure guano.
The Guanay Cormorant has historically been the most important producer of guano.

Guano (via Spanish, ultimately from the Quechua wanu) is the excrement of seabirds, cave-dwelling bats, pinnipeds, or (in English usage) birds more generally.[1] As a manure, guano is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate, and potassium, three nutrients essential for plant growth. The nineteenth-century guano trade played a pivotal role in the development of modern input-intensive farming practices and inspired the formal colonization of remote bird islands in many parts of the world. During the twentieth century, guano-producing birds became an important target of conservation programs and influenced the development of environmental consciousness. Today, guano is increasingly sought after by organic farmers.[2]