How one Napa vineyard might have saved millions of dollars by using birds as pest control

NAPA, California — On a damp and gray Friday at Bouchaine Vineyards, Rebecca Rosen looked up, noticed the handful of ravens circling above her and lobbed an insult. “Jerks!” she yelled. They flew together, swirling and squawking as she walked to the trunk of her Tesla Model S and pulled out the box. There, she hides her ammo: a 6-year-old Harris’ hawk named Rocky, a 17-year-old falcon named E.B. and a 4-year-old spectacled owl named Hootbert, whose only job is to perch himself on a chair and let some tipsy wine tasters snap a photo. Rocky is the real threat. Rosen pulled him out of the box, re...