Figure 1.

Figure illustrating the test arena where the human approach test and the novel object test was performed. The human or novel object (NO) was positioned just outside the transparent wall. The birds were placed in the arena through the start box (S). The EthoVision XT camera was mounted in the ceiling above zone 3 and pointed down. There was an additional camera (cam) next to the human/novel object. Numbers 1–5 represent zones of increasing distance from the test stimuli.