They live in social groups with a dominant female as their leader ... ranging from the tiny pygmy marmoset at 5 inches and 3.5 ounces to the male mandrill which reaches over 3 feet in height and up to ...

President Trump issued an executive order declaring that the U.S. government would only recognize a person’s sex assigned at ...

In an evolutionary battle of the sexes, scientists have found that male flies sharpen their eyesight to avoid being tricked ...

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

With bloated bellies and hairy legs, female flies try to look bigger to get food from courting mates. But male flies, in turn, have sharpened their eyesight to call their bluff. A new study by ...

Still, more say all-female groups have a positive impact on women’s well-being (67%) than say the same about the impact of male-only groups on men (56%). In thinking about the impact these types of ...

The Alabama legislation, which passed the Senate on Thursday, would create legal definitions of male and female based on the reproductive organs at birth. At least nine other states have enacted ...

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 ...

During his inaugural speech, Trump said: “there are only two genders — male and female.” Trump’s edict requires government agencies to use the “immutable” designation on forms and IDs ...

Pros and Cons of Choosing a Male or a Female Dog for Adoption When it comes to adopting a dog, one of the first decisions prospective pet owners face is whether to choose a male or female dog. Each ...