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guano(gwä`nō), dried excrement of sea birds and bats found principally on the coastal islands of Peru, Africa, Chile, and the West Indies. It contains about 6% phosphorus, 9% nitrogen, 2% potassium, and moisture. Guano is found mixed with feathers and bones and is used as a fertilizer.
the decomposed (in dry climate) droppings of gulls and other sea fowl.
Guano is used as a valuable nitrogen and phosphorus fertilizer; it contains about 9 percent nitrogen and 13 percent phosphoric acid, potassium, and calcium. Accumulations of guano are found on islands off the coasts of Chile, Peru, and South Africa as well as on the islands of the Caribbean. Guano is also the name given to the artificially prepared (mainly in Japan and Norway) mineral fertilizers from the waste products of the fishing and seal-hunting industries.