Years ago, when our town had an open dump, ravens were quite common. And comical too as they hopped down the main street sidewalks. But since I started photographing birds, I rarely see them at close range and still don't have a good shot of our northern Common Raven. So, I was pleasantly surprised when, at the Buenos Aires NWR, SW of Tucson, I ran into a pair of Chihuahuan Ravens, a distinct species. We were advised to keep a close eye on all food stuffs as the pair were known to authorities! Chihuahuan Ravens are larger than crows, but not as large as our northern species. That's the way it goes, I guess; I've heard that the Alaskan sub-species is even larger than our MN variety.