Thanks for your input JPAZ. This was the first and only time I saw a Cooper's hawk in the area (and the only time I've ever seen one). I turned around at it was just sitting there. I took a few pictures before trying to creep closer, but as soon as I moved it took off. I haven't seen it since. I've never seen a Sharp-Shinned hawk. There is an adult Rough-legged hawk in the area, so I think jmeyer's id (further on in this chain) of Rough-legged hawk makes perfect sense. Hawks seem to have so many morphs it's hard for an amateur to tell the difference between some of the hawk species. The adult vs. juvenile differences make it even more complex.Does look like a Cooper's hawk to me in the first two. The third might be a juvenile Cooper's Hawk but it is hard to differentiate from the Sharp-Skinned.