"Each duck can eat as many as 200 locusts per day. In 2000, a 700,000-strong army of ducks and chickens were sent to Xinjiang to tame a swarm of locusts that had devoured over 3.8 million hectares of crops and grassland. At that time, researchers found the ducks were more efficient than chickens at gorging the pests.

And people can then eat the ducks.