A global study reveals sexual selection influences life expectancy differences between sexes in mammals and birds, reshaping aging research and public health.

"Who Has the Most Beautiful Mane in the Land?" – A magnificent coat may help lions attract mates, but it likely costs them years of life. Photo: Getty Images Peacock males display their magnificent ...

This important work fills a gap in the characterization of motor architecture and chemical coupling of the male reproductive system, crucial to understanding male reproduction and fertility. The ...

Peacock males display their magnificent plumage, lion males fight bloody battles for a pride—and both pay for it with years of their lives. What appears to be heroic courtship rituals or fierce ...