https://www.youtube.com/watch?v=niLxhiywXqw

I wish they would have given them different colored collars. I don't
think it is the same one swinging long every time.

Actually one comment says that one collar is red and the other is
blue, but I can't tell the color most of the time.

I think it is the red guy swinging long most of the time. I still
can't really tell.