The evolution of the multicoloured face of mandrills: insights from the perceptual space of colour vision.

In addition, mean differences between the three rank groups were highly significant for blue-red contrast residuals (Kruskal-Wallis χ 2 = 12.5, p = 0.0018) while being not significant for blue saturation residuals (KW χ 2 = 5.68, p = 0.058) and for red saturation residuals (Kruskal-Wallis χ 2 = 5.45, p = 0.065), although both are close to significance.

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