I find these guys moving as a group with one or two white grub looking worms along with them. I see them at night or early morning on our sidewalk. They were moving in a circle the other night (pict below). I didn’t know to look under worms, grubs, or caterpillars. I live in southern Connecticut. Any help would be great.
You have caterpillars known commonly as Army Worms. These are ravenous, very destructive moth larvae that live their early lives in groups, later dispersing as they grow. Here is a good site with addtional information.