guano

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guano

the white nitrogenous dried excrement, high in uric acid content, that is produced by birds and reptiles. Guano is a valuable fertilizer and has been extensively harvested from guano bird (cormorant) colonies in South America.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005