Fig. 1. Maps of the frontal visual fields of the left eyes of male Caligo memnon (A,B) and male Morpho peleides (C,D) with isolines representing facet diameter D, in µm (A,C), and interommatidial angle , in degrees (B,D). The globes represent the three-dimensional space around the butterfly (with lines of latitude and longitudes in 10° steps), with the eye located at the globe's centre. The arrows indicate the orientation of the butterfly: A, anterior; D, dorsal; V, ventral; L, lateral. The boundary of the eye's receptive field is also indicated by the dorso-ventrally oriented contour in each panel.