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Fig. 1. Hermetia illucens, head angle directions, and the experimental
setup. (A) Dorsal view of a standing fly. Scale bar, 1 cm and applies to all
panels. (B) Lateral and (C) ventral views of a mounted fly with both flags
fixed to the head. Air puffs to the two flags move the head around the pitch
(black arrows to distal flag 2), yaw (hatched arrows to proximal flag 2), and
roll (white arrows to flag 1) axes. White circles flanking the mouth in C
indicate the digitized points.