Emily Cory has installed a puzzle box in the parking lot in hopes of keeping the birds occupied. To get a food reward, the clever birds will have to open a latch on the box.
If they figure it out, Cory plans to make the challenge harder by adding latches.
In the last 18 months, the birds have ripped out wiper blades and weatherstripping from U.S. Forest Service and employee vehicles.
Forest Service biologist Janie Agyagos has been compiling a dossier on the delinquent ravens. She tells the Arizona Daily Star she has documented about $700 in damage so far.