Figure 2. Absence of a nest hill impairs the navigation of salt pan ants (A–F) Trajectories of zero-vector ants of a salt pan nest (A–C) or shore nest (D–F) with nest hill present (left) or absent (right) after 5, 7.5, and 10 m displacement (colored circumferences indicate each displacement distance). Highlighted in bold is a trajectory exemplar of an ant for each displacement distance. (G–I) Straightness scores (i.e., run length divided by beeline) of homing ants of both nest types for the different displacement distances (Kruskal-Wallis test with Dunn's multiple comparisons test for selected pairs, **p <0.01; ***p <0.001, bars indicate median ± SD). (J–L) Success rates of homing ants of both nest types for the different displacement distances (Fisher's exact test, *p <0.05). Ants that during nest search left the tracking grid (radius, 20 m) around the nest entrance were classified as ''unsuccessful'' and are represented as crosses at the edges of the arenas.