Not a Unicorn

The first time I saw this mule deer in my yard, I thought he was a unicorn. I asked him where his other antler was, and he just glared at me. Then I got a better look at him a few months later when he was at my wildlife bubbler, and I realized that his left horn is growing out of the side of his head. His black forehead is also unusual. 

Usually, the deer come to my bubbler in a small herd of three to eight deer. He is always by himself. I wonder if he prefers it that way, or if the other deer have ostracized him like poor Rudolph the Red Nosed Reindeer.