» For other uses, see Guano (disambiguation). Guano (from the Quechua 'wanu', via Spanish) is the feces of seabirds, bats, and seals . It 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 much more productive by addition of this manure. Usage Guano consists of ammonia, along with uric, phosphoric, oxalic… (More on Guano)