When the female is as beautifully coloured as the male, which is not rarely the case with birds and butterflies, the cause apparently lies in the colours acquired through sexual selection having been transmitted to both sexes, instead of to the males alone.
Emeak arrak bezain kolore dotoreak dituenean, txori eta tximeletetan hain bakanki gertatzen ez den kontua berau, badirudi hori hautespen sexualaren bidez harturiko koloreak, arrei bakarrik barik, emeei ere trasmititu zaizkielako gertatzen dela.