A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

While most animals reproduce sexually, some species rely solely on females for parthenogenetic reproduction. Even in these ...

The first evidence pointing to the unique daily problems faced by alpha male baboons arrived in 2011, when Gesquiere and colleagues identified that the animals displayed higher amounts of ...

Trump's executive order declares sex as "an individual's immutable biological classification as either male or female" and states that "gender identity" cannot be included in the definition of ...

Entertainment/NBCU Photo Bank via Getty Armie Hammer is sharing the shocking details of how he ate an animal's "warm" heart ... like an almost overly-charged male rite of passage when you go ...

The accused first tied the dog’s legs then attempted to hang the animal, and subsequently used a knife to stab its left eye, causing the eye to be dislodged. The PFA official pointed out that ...

they also use sound-cancelling wing-flicks to jockey with rivals. This new understanding of how male flies compete for female partners could shed ...

Here’s what happened next. From animal encounters to Chance Encounters, CNN Travel’s hit series about love and friendship is now a new CNN podcast. Host Francesca Street chronicles marvelous ...

This is the shocking moment a female police officer flips her patrol car before lying and saying an animal ran in front of the vehicle. Police constable Charlotte Morris appeared in front of a ...