Figure 1.

Experimental set-up. (a) A hand-reared fledgling (on the left) that was imprinted on a ‘mother’ (on the right), following her on the foraging grid during one of the training sessions. (b) A schematic illustration of one of the artificial leaves comprising the task. Note the X-shaped slit located in the middle of the leaf (right above the well), through which the pecking demonstration was done, and the folding of the leaf tip that made the pushing behaviour easier. (Online version in colour.)