Snapshot of a swarm and experimental arrangement.
(a–c) Snapshots from each of the three synchronized cameras (left, center and right, respectively) focused on a common volume near the center of the swarm. Regions identified as midges are coloured red. (d) The experimental arrangement, seen from above and drawn to scale. Swarming midges remain far from container boundaries. (e) The corresponding three-dimensional snapshot. An arrow indicates the location of each tracked midge; the arrow lengths are proportional to speed and their orientations indicate flight direction. (f) The same snapshot, with each individual's current position indicated by a dot and past flight path indicated by a curve.