It is a ufology phenomena mainly. There are a lot of "unexplained" videos showing these "UFO`s". They get really excited about them. Many claim that exactly the same looking ones as 'seen' in the OP`s video actually create crop circles... (as well as ignore contrails)
Same light "orbs"? (birds/paper bags...)
With the one that looks like birds creating a pattern as they fly over it:The guy who filmed this video actually admitted it to be fake... He even explained how he did it and it's even demonstrated how he did it.
edit: here - just in case anyone thinks these "orbs" are real...
http://www.robertschoch.net/Crop Cir...d LWCMD CT.htm