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Fig. 1. The experimental arena. (A,C) Experimental arena and training layout. Ants
travelled along an open-topped, narrow channel and under a large cylinder
before heading over an open arena to the feeder. The feeder was at the bottom
of a small pit (shown enlarged in A) and for the first experiment, a small
barrier was placed around the pit to prevent the ants from viewing the
landmark and its surroundings from the pit (B,D). In tests ants were taken
directly from the nest and placed on a feeder (indicated by F). Two landmarks
(large black circles) were positioned symmetrically in the arena. Cumulative
density distributions of all return trajectories from ants trained with the
channel on the left or right, respectively. Dark areas represent areas where
ants spent the most time. Values are given as proportion of the total time
spent in the arena. Because of the large amount of time spent at or near the
feeder, all values above 2.5% are represented as black squares.
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