You would be surprised. I did see ravens on this part of Arizona, once. It was back in my freshman year of highschool, when I was waiting for the gate to open. They were sitting on top of the lamp posts in the parking lot. Was very unusual to see them. If only I had my camera, because they looked really cool with the cloudy sky in the background.
Still it may be unlikely. Though whenever I'd listen for her, I would hear this one bird that made a similar call. I don't know if it was the natural call of that bird, or a trolling mockingbird that picked up the call. It made it very annoying.