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Fig. 5. Search density distributions of ants within the test area after different outbound runs (N=27 in A, N=22 in B, N=21 in C, N=20 in D). One pixel represents an area of 0.25 mx0.25 m. Densities are defined as the summed path lengths within one pixel, divided by the total path length for all pixels of each test situation. The obtained values for each pixel are colour-coded from black (minimal value; 0) to red (maximal value; 0.845 in A, 0.926 in B and C, 0.773 in D). R, point of release; NG depicts the relative nest position according to ground distance in the 3D test (A), ground distance control (B), and straight control (D). NW is the relative nest position in walking distance controls (C). Square brackets in B and C indicate the predicted nest position of the other control group, respectively, and are shown for comparison.





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