Guano

The nest of the Peruvian booby is made of almost pure guano.

Human-made Guano Island near Walvis Bay in Namibia

Guano is the excrement of bats and birds. This excrement is exceptionally high in nitrogen, phosphate, and potassium, three nutrients which are essential for plant growth. Therefore, it is often used as fertilizer, to make plants grow more quickly.

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