In the field, we tested the response of wild client fish to seven fish models made from resin and painted with a range of colors and patterns (as per Figure 4). The first three models (Figures 4A–4C) were representative of adult Labroides dimidiatus. Model A was painted to be a true representation of L. dimidiatus, with the percentages of each colored area estimated from color photographs of L. dimidiatus (fish were photographed on the Great Barrier Reef). Blue was omitted from model B, and red replaced blue in model C. Model D represented the colors and patterns of a control fish, Halichoeres melanurus, which is of a size and shape similar to L. dimidiatus [16]; models E–G were painted different patterns to represent novel fish species. Models F and G had areas of blue, yellow, and black approximately equal to model A. The painted models were measured with a spectrometer, and colors were determined to be similar to those reflected from cleaner fish ( Figure 2)