Did I just photograph a spirit?

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I've been up all night, and when dawn broke, there was a very lovely set of sunrise colors streaking across the sky. So, I zipped out to the backyard and took a bunch of photos. I allowed a second or two lapse between each shot. Nothing looked different in the scene, from one shot to the next, so far as I could see. The only difference was that I moved a bit to the right as I was shooting. But look what's in the pictures - it's as if a spirit went flying by while I was shooting.
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Those are the shots, exactly as they came from the camera. What do you think?????????
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