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guano

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Accumulated bird excrement, primarily found on islands like those off Peru. It is rich in nitrogen and was a highly valuable commodity as fertilizer in the 19th century.

Videos Mentioning guano

The Man Who Killed Millions and Saved Billions (Clean Version)

The Man Who Killed Millions and Saved Billions (Clean Version)

Veritasium

Accumulated bird excrement, primarily found on islands like those off Peru. It is rich in nitrogen and was a highly valuable commodity as fertilizer in the 19th century.