Data from: Are red bishops red enough? On the persistence of a generalized receiver bias in Euplectes

Calum E. Ninnes, Stacey L. Webb & Staffan Andersson
In the genus Euplectes (17 species of widowbirds and bishops), red carotenoid-based coloration has been found to function in male contest competition over territories and appears to exploit a generalized receiver bias by which redder (more longwave) hues are perceived as more aversive or intimidating. A major piece missing, however, is that among the 5 most extensively red species, forming the clade of “red bishops,” the agonistic function has remained unexplored or undetected. Moreover, does...
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