Fig. 3.

Avian sensory color space filled with (a) 1300 reflectance data from the flowers of 876 plant species (as some flowers present several colors, several points belong to the same species); (b) reflectance data of fruits from 948 plant species. uv, l, m and s represent the maximum stimulation of uv-, long-, medium- and short-wavelength sensitivity cones of birds’ eyes. The authors showed that color diversity of fruits, measured as the volume of convex hulls in the space and corrected for the difference in sample size, was almost half the color diversity of flowers. Figure reproduced, with permission, from Stournaras et al. (2013) © 2013 John Wiley & Sons Inc.