Guano (from the Quechua 'wanu', via Spanish) is the excrement (feces and urine) of seabirds, bats, and seals. Guano manure is an effective fertilizer and gunpowder ingredient due to its high levels of phosphorus and nitrogen and also its lack of odor. Superphosphate made from guano is used for aerial topdressing. Soil that's deficient in organic matter can be made more productive by addition of this manure. Usage Guano consists of ammonia, along with uric, phosphoric, oxalic, and carbonic acids… (More on Guano)