While we were in the desert in Arizona, at a highway rest stop, I witnessed an interesting behavior. It was not a very bird-friendly habitat. Hard to imagine them finding very much to eat, but here was a great big raven looking fat and happy. I walked over to where he was lounging in the shade and watched him. A car pulled up and parked right across the sidewalk from him. The driver got out and walked past the bird to use the facility. As soon as the driver was clear, the raven fluttered over to the car and proceed to jump up and down in front of it picking nice fresh bugs off the grille! He ate his fill, cleaning off the front of the car quite nicely, then went back to the shade, waiting for the next car/meal to arrive.
Pretty good for a birdbrain!