You are of course right about "a few feet " Albert.
It may not even be living.
It is hard to credit a large weather balloon going all over the place like that though.
Maybe it is a "party balloon" a few km away,drifting up from a house party! Catching the wind and reversing direction as it cleared the houses.
"Reproducible Experimentation" may provide an answer it all right.
Insects and spiders crawling inside optics would be completely invisible in a image, like the secondary mirror holder.
Peter.
  