What it is---a Mystery

When I'm outdoors taking pictures I very rarely disturb what I'm photographing. I like to get in close enough to get the picture, yet not enough to disturb anything that may be resting. I rarely regret this policy, but this photo of an insect that I shot yesterday gave me some regret.

The insect could be a fly, but I'm bothered by that tail looking so much like a dragonfly and that body, and then notice the feathered antennae. Is it one insect or one sitting on top of another? If I would have disturbed it I would at least know if this picture was a composite or just a very funny looking insect. Off to BugGuide for some research...