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Fig. 3. Search density distribution of the ants' nest search behaviour exhibited
under different training and test conditions. Control 1: ants were trained and
tested without any landmark. Control 2: ants were trained with a landmark
located at the nest entrance but tested without one. Test 1A: ants were
trained and tested with a landmark at the nest entrance. Black square,
position of landmark; dotted line, position of path-integrator-defined
nest.