Data from: The evolution of iris colour in relation to nocturnality in owls

Arianna Passarotto, Deseada Parejo, Angel Cruz‐Miralles & J. M. Aviles
Birds, due to their multiple colourful displays, constitute a classic paradigm for the study of colour evolution. Although avian eyes are remarkably coloured, the functional basis behind inter‐specific variability in iris colouration remains poorly understood. Owls are an ideal system to shed light on the role of ecology in promoting iris colour evolution as they show inter‐specific variation in iris colour and in niche specialization with some species being strictly nocturnal and others active during...
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