Figure 2.

In the upper section is a schematic from the visual condition of the Jelbert et al. [28] experiment. Each board was coloured with a different colour pattern and only one of the four flowers on each contained reward. On the board labelled background 1, the correct (i.e. the one containing reward) flower was the pink one on the top of the board, whereas on the board labelled background 2, the correct flower was the green one at the bottom of the board. In the lower section is a schematic showing the sequence of presentation to the hummingbird: once the bird had fed from the feeder, the first whiteboard was presented. On this board the orange flower at the bottom contained reward, while on the board that followed the bird would find reward only in the purple flower at the top of the board. The feeder would then be returned and the next trial would begin. From Jelbert et al. [28].