Fig. 2. Route shapes survive the removal or displacement of the cylinder. (A) Headings of trained ants when no landmark was present and (B) when the landmark was shifted to the opposite side from that in training. Data from ants trained with the landmark to the right of their route are mirrored to generate a single data set (no landmark: n=66, N=14; landmark opposite: n=23, N=8). Each dash marks the point of intersection of one trajectory with a semi-circle centred on the start with a radius of 20 cm, 40 cm, 60 cm or 80 cm. Open triangles show the mean heading at each distance. (C,D) Sample trajectories from one ant in each test condition. Open circles represent the position of the landmark during training, and the filled circle in D represents the position of the landmark in test runs.

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