Illustration of the large cages. The typical arrangement of the swarming stimuli (left) is represented by the black-bordered swarm marker (M) surrounded by the black artificial horizon lining the interior of each cage. Above these and outside of the cage, the black baffle (B) is represented, preventing the three lights from shining directly into the cages but upward onto the wall (W). Also shown are the locations of sugar sources (S) and resting shelters (R) flat against the floor. The swarming stimuli and controls were switched between rooms to determine whether there was any effect of insectary.