Appear to be dead, possibly a shed husk of some kind. found in the bark of a fallen log, possibly a "dark brown click beetle" according to an online source.
I was walking along the loop road, and I almost stepped on these ants. I suppose that they were moving home. This huge group of ants formed a "U"-shape, so I was amazed and shocked to see so many of them moving together.
I was going to walk down to East, and then I heard some moves. When I searched for the sound source, I saw two rabbits digging food the woods, and they did not get frightened to see me approaching.