Researchers who analyzed data from zoo animals found that it is not only genetics, but mating pressures that may determine ...

Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study ...

The new species of burrowing spider wowed scientists when one of the specimens turned out to have both female and male ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

Editor’s Note: The views expressed in this commentary are solely those of the writers. CNN is showcasing the work of The Conversation, a collaboration between journalists and academics to provide news ...

A lower percentage of males improves mating behaviour and feather cover, with similar reproduction results and higher ...

A Vermont elementary school is reportedly removing "male" and "female" language from its fifth grade science lessons covering the human body, puberty and reproduction. In a letter sent home to parents ...