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- Dictionaryguano/ˈɡwɑːnəʊ/
noun
- 1. the excrement of seabirds and bats, used as fertilizer.
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noun
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Excrement of seabirds, cave-dwelling bats, pinnipeds, or birds more generally
Guano is the accumulated excrement of seabirds or bats. Guano is a highly effective fertilizer due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. Guano was also, to a lesser extent, sought for the production of gunpowder and other explosive materials. Wikipedia