The drones can emit a noise to keep the birds from undoing all the farmers' hard work. — 123rf.com
Ephraim Kofi Kenney does not like to work in the fields scaring pests away. But today he must.
A flock of migratory birds has repeatedly invaded his parents' rice plot outside Accra, Ghana's capital, and the 16-year-old has been tasked with keeping the invaders away from the young crop.
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