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Guano Facts for Kids. Kiddle Encyclopedia.
Guano is the excrement (waste product) of bats and birds. It is exceptionally high in nitrogen, phosphate, and potassium, three nutrients essential for plant growth. Therefore it is often used as fertilizer, to make plants grow more quickly.
Mining guano in the Chincha Islands off the central coast of Peru c. 1860.
A herring gull (Larus argentatus) excreting waste near Île-de-Bréhat.