Male genitalia exhibit extreme morphological diversity among animals, but its diversification mechanism has not been fully elucidated. In insects, the intromittent membranous part has been barely stud
Plumage colour scores (N=5831 species) and predictor variables (N = 2471 species) in passerine birds. This data set includes plumage scores for males and females as calculated from RGB (red, green, b
