Definitely a real deer, not a decoy, unless they make decoys with real fur and position the legs so close together that the thing could never stand.

I don't know -- seems like a poacher would do more to hide the evidence and anybody out bowhunting for deer would have cleared some room in the truck for the expected kill.

Maybe given the low temp, he figured a deer killed on the road that day would technically be fresh enough to use for taxidermy?

I hope he wasn't planning to eat it, anyway!