Fig. 3. Correct choice ratio for different sizes of target. Results of the blue- (A), green- (B) and red- (C) trained butterflies. The correct choice ratio is close to 0.5 (dotted lines) when the visual subtended angle of the disk is smaller than about 1.0°. Values are mean ± s.d. For an explanation of Gr-s, Gr-b, Gr-g and Gr-r, see Fig. 2 and Table 1.