Yes, it shows the trail of dirt on the second floor. I have moved palisades around to different areas at my base and the larva has randomly moved. The grubs seem to stay in the main building. My main base is at the hollowed out log area in the ceremony area. I've had the larva moving around under the pebblet flooring in the main base building, outside in the yard area and even on top of the hollowed out log. It's all within the palisades. It's kind of annoying b/c it's really loud but at least I can find the larva & kill every time it respawns.