Fig. 7. (A) Walking paths of ants trained to walk from an artificial feeder to the nest, then captured at the feeder and displaced to the position marked by the open square. On their homeward runs towards the fictive position of the nest, they were presented with two black cylinders (0.40 m high, 0.25 m wide and 2.0 m apart from each other; see filled red circles). N=15 (left figure) and 16 (right figure). Recordings taken by B. Michel. (B) Walking paths of ants trained to return to a place (their nesting site) surrounded by three black cylinders (0.40 m high and 0.25 m wide, see filled red circles) positioned at the corners of an equilateral triangle and 2.0 m apart from the entrance of the nest. After training, the three-cylinder landmark array was established within a distant test area where 45 trajectories of 3 min search paths of 17 ants were recorded. While concentrating their search about the fictive position of the nest (the centre of the landmark array), the ants avoided the immediate neighbourhood of the landmarks. The three blue dots mark the positions at which the ants were released. Recordings taken by P. Antonsen.