Fig. 2

The results of experiments one and two, showing the proportion of choices (mean ± 95% C.I., n = 80 per visual angle category) by D. hydei (dark points and line) and M. domestica (light points and line) for a white spider model and b yellow spider model, each versus a plain “average” background, as a function of the visual angle subtended by models. Dashed lines indicate mean choice frequencies within homogenous sets, as determined by a-posteriori simultaneous G-tests (Table 2). Stylized spider model images (inset) are shown to loosely approximate how the banded pattern would appear across this range given the known limits of fly spatial (but not spectral) resolution