Odd shaped thing in sky

I haven't got a clue as to what this could be, just pointing it out.

It has a dark 'head' and 'wings'.

????

I went to the MER analysts notebook and got a higher res PNG and a bitmap of this frame.
It appears the lower wing is just a jpeg artifact, perhaps it is an airborne dust mote close to the lens, but it still has a tail on it.

Sol 580 Sky Worm

Another image for the 'thingy' box.

looks like a bolide viewed from behind. Or dust. Could it be the top of a dissipating dust-devil?

Not a dust devil bit, it is only on one frame and, I hate it when this happens, there is no right eye image to verify the object with.
Is there a thread on the forum for thing images?