Creatures of the Night

I was falling asleep when I heard some strange noise coming in from outside. I lay down still for a while to listen. It sounded like something pulling on the grass outside and I was guessing what it could be. I came to the conclusion that only a horse could be out there, but at that hour? I moved the curtains so I could get a good look outside and I saw what I saw. I saw three of them at first and decided it was the only time I could get a good picture of some beautiful horses. After I took them, I didn't think they were all that beautiful. They even scared me. For a moment I thought they were spirits. Stupid of me. I stood watching them for a long time until they left.

Here they are:

That there was the one I didn't see. He was the last one to leave. I say he, I'm not sure.