Spectral reflection curves of the stimuli used in our experiments and relative absorptions of the three honeybee’s photoreceptors, S, M and L (shown in gray). The colors distances between these colors in two perceptual spaces proposed for the honey bee, the color hexagon (Chittka, ) and the color opponent coding space (Backhaus, ) were high enough as to allow discrimination in all cases (Dyer et al., ; see Table ).