Fig. 2. Search density distributions for a group of individually tracked desert ants searching for the fictive position of the nest located within a four-cylinder landmark array. Search density distributions are given for releases from directions identical with (SE) or different from (NW, NE, SW) the training direction. If it lived long enough to complete the experimental period, each ant had been released from all four directions. An open circle depicts the position of the hypothetical nest. The sides of the square are 282 cm between the centres of the landmarks. The four cylindrical landmarks are positioned in each of the four corners of the search density square. Colour scales indicating the relative search densities in each 20 cmx20 cm square pixel are given beneath the distribution for each group. N=16 (NW), N=18 (NE), N=20 (SW) and N=22 (SE) ants.

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