I just exited Whiterun and there is what seems to be a dragon tail sticking out above the entrance archway. I do not remember seeing it there before. I reloaded my game from a previous save and it's still there when I exit the city. It kinda looks like the skeletal tail of the dragon to and it just hangs there.

Edit: Okay that tail was a skeleton dragon because I exited the town multiple times to see if the dragon tail would till be hanging out of the wall. The next time I exited the town the skeleton dropped on top of me and currently is laying in front of the gates of Whiterun. I did not kill this dragon here but at the watch tower where the Jarl of Whiterun sends me to kill my first dragon. The skeletons name is Mirmulnir. That's one serious bug if dragon skeletons are going to drop out of nowhere.

2nd Edit: I chose just to ignore this issue in general and continue to play my game since I thought the skeleton would just remain there in front of the gate. I exited Whiterun and this time it came out of the ground slowly til the entire skeleton was out of the ground and just laid in front of me.

It will disappear after a while of playing, I'm sure Bethesda will look into it for the next title update.

Hope I helped.

After 4 hours of play plus several dragons killed later, that skeleton is still there coming out of the ground, dropping out of the sky or just laying there in front of the gate everytime I leave Whiterun. Although this is not game breaking, it did give a shock factor a few times where I spazzed out and didn't know what was going on for a moment.

I posted earlier today that the first dragon i killed (by the Whiterun tower) was stalking me

It's corpse seems to spawn randomly within whiterun's hold and its currently on its 3rd dodgy spawn, which placed it outside the stables, quite a distance from the previous dodgy spawn halfway up a mountain!

I swear that Dragon corpse is trolling me >.>