Ducks on patrol

Since the 1980s, hundreds of ducks have patrolled Vergenoegd Löw Wine Estate outside Cape Town, South Africa. The winery currently "employs" some 1,600 Indian Runner ducks -- a flightless species with a peculiarly upright stance and highly developed sense of smell. As ducks cruise around the vineyard grounds, they eat pests such as snails, fertilizing the ground as they go.

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