"He also transferred their droppings, so they could smell a bat-friendly area, " Barclay says.

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Their droppings on outdoor furniture cushions are aggravating and time-consuming to clean up.

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Kuan-Shu says the ducks cut down on pests such as golden apple snails while fertilizing the rice with their droppings.

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He said that droppings would be submitted to their laboratories for assessment.

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And the firm has had their head in the emerging market game since it started selling Peruvian seagull droppings as fertilizer for British farmers back in the 1860s.

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