Fig. 2. Representative frames showing the animated lizard (circled) against the background at 1 m (A), 3 m (B) and 6 m (C). Different background plant sequences were used for each relative distance in order to keep the size of the lizard proportional to the background. Although the 3D animated lizard appeared at roughly the same perch site in each of the sequences, the structure of background visual motion varied in an ecologically meaningful way between the sequences.