On closer inspection, I could see that it was hurt. In fact all but a few of the "horn" tuffs on its right side were missing. The eye appears swollen and it looks bloody above it. The dark areas on the body are where the outer, longer feathers are missing. Some are wing feathers which may explain why it did not flee when I approached the fence for a closer shot.
Poor thing. It made us wonder what the story was. A territory or mating fight? (I later read that they mate in the winter, so that wasn't it.) A hungry bobcat or coyote? Or did it fly into the path of a car. We will never know.
As an aside: this is our 1300th post on this blog. Whoooo'd a-thunk it?