A single gene in the shorebird species known as ruffs controls the levels of testosterone in males, and this in turn affects ...

Just like in “When Harry Met Sally”, the answer isn’t so simple for Kinda baboons, which form long-term friendships between the sexes.

Marmalade hoverflies leave northern Europe each autumn to escape the cold winter. A study, by the University of Exeter, compared the number of males and females migrating at a northern point (Denmark) ...

A new study observed Amazon river dolphins for 218.9 hours and saw males spurt urine into the air 36 times—proof that the behavior is more common than we thought.

Study author Justin Scioli told McClatchy News that the shrimps are a type of hermaphrodite that all start out as males but later develop both male and female sexual functions. The new species takes ...

We also tested eight laboratory Nyassachromis prostoma “Orange Cap” individuals, as our Bionano data identified a male that was heterozygous for the inversion on 11 and a female that was homozygous ...

One of the female contingents on Fly Team is analyst, Special Agent Amanda Tate (Christina Wolfe). Despite having a sedentary role within the unit, Tate had earned enough of Wes' trust to be put ...

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There are many interesting ways to reproduce in nature, and some creatures do the unusual path of reproducing by utilising their mouth.

According to the order, the US only recognizes two sexes, male and female, which are defined respectively as a "person belonging, at conception, to the sex that produces the small reproductive ...

Sex' shall refer to an individual’s immutable biological classification as either male or female," Trump's executive order declares. "'Female' means a person belonging, at conception ...