Fig. 6. Angular distribution of zero-vector ants released within the test area without barrier. The ants (N=22) were released within a test area devoid of landmarks, and their trajectories were recorded for 5 min each. The first intersections (filled circles) of their trajectories with concentric circles (radii 1, 2, 3 and 4 m) centred on the point of release () do not show any directional preference (P>0.2 for all circles, Rayleigh test).

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