When the top spotty fish in a tank disappears, the runner-up turns aggressive within minutes, rushing and nipping rivals ...

A new study that looked at gut length variation between cichlid fish species found that some of the genetic loci for the ...

The experiments show that changes in iron levels can lead male mammalian embryos to develop female sex characteristics, regardless of their genetics.

If you've got a manual on USB ports or have watched any kind of video, you may have heard them referred to as Male or Female ports. Here's what that means.

Male blue-lined octopuses inject a powerful neurotoxin into the hearts of females before mating to avoid being eaten, according to a new study.

During mating, some male octopuses inject females with their potent venom to paralyse them – and avoid being eaten by their mates.

Trump's definition of 'male,' 'female' criticized by medical and legal experts President Trump issued an executive order limiting gender definitions on Monday.

President Trump will on his first day in office Monday issue an order defining a person's sex as "male or female" — requiring government agencies to use the "immutable" designation on forms and ...

More say all-female social groups have a positive impact on women’s well-being than say this about all-male groups' impact on men.

This article will explore how female stalkers differ from male stalkers, shedding light on this often misunderstood issue.

Key points A new study from Stanford shows remarkable differences between female and male brains. The researchers found no overlap between male and female, and rejected the idea of a "continuum ...