A female may choose a male from several because he is attractive ... Looks are certainly important for the peacock, with his absurdly bright, burdensome train that he shows off to attract a ...

A series of studies published in the American Journal of Human Biology suggests that human upper limb length may be a result ...

That is why, evolutionary biologists say, males are most often the ornamented sex. It is why the male peacock unfurls his dazzling train, why male guppies are adorned with bright orange and blue ...