I laid down and shuffled my body tight under the lip of the collection tub. I craned my head back and could hear the first high-pitched fluttering sounds passing over the top of my position. The skull-flies zipped over too fast to get a decent look at them, their shadows flashing like a strobe light. The harvester stopped momentarily as if to acknowledge the new intruders. I know this not to be the case though; these gentle giants are autonomous but have little to no higher brain functions. I reached up to grab the lip fearing that the beast was going to draw in air but it resumed its slow steps satisfied that all was acceptable. The flies all had passed overhead and the buzzing sound was fading