When it's time to pick their four acres of wine grapes, Carl and Rita Comfort would rather the birds didn't beat them to it. Without some form of bird control, they could lose about 10% of their harvest. So at their vineyard, Comforts of Whidbey, they broadcast the distress calls of birds…

Roughly 99% of a swallow's diet is flying insects. They gulp down millions of flies, mosquitoes, and agricultural pests, in the course of feeding themselves and their young. The world population of Barn Swallows is estimated to be 190 million. If each ate just 350 insects per day, that…