“What is this little guy?” asks Valerie in her submission regarding the black, worm-like critter pictured below. “About 4-inches long, needle thin, in the muddy bank of a river in the Shenandoah Valley of Virginia.” To start with, we want to thank Valerie for the excellent photo and video she sent in. The video captures the sporadic, twisty movements of the worm, and the picture gives us a good sense of scale, showing us how long this worm really is. Based on this information, as well as the context Valerie provided, we think that she found a horsehair worm.