SAPPORO, Japan, Oct. 17 (UPI) --All all-female species can grow their populations much quicker than a species that is half male, half female. Males can't birth offspring, but they do offer valuable ...

A hybrid species of all-female fish in the north Pacific Ocean may have survived for an uncharacteristically long period of time by switching mating species, say scientists. A hybrid species of ...

Most systemic autoimmune diseases occur more frequently in females than in males. This is particularly evident in Sjögren’s syndrome, systemic lupus erythromatosis (SLE) and thyroid autoimmunity, ...

A strange discovery in southern Brazil has left the scientific community stunned. In 2021, a female canid was found near Vacaria, a city in the state of Rio Grande do Sul, after being struck by a car.

The bear scientists shot in the Canadian arctic in 2016 was a biological mystery. It looked like a grizzly bear, complete with long claws and a prominent snout, but most of its fur was white. Call it ...

The bones of horse-like creatures unearthed in a 4500-year-old royal tomb in Syria are the earliest known hybrid animals bred by people, with DNA sequencing showing them to be crosses of donkeys and ...

A team of geneticists, archaeologists, and paleontologists believes they’ve settled the identity of an enigmatic equid from ancient Mesopotamia. That animal is a kunga, which the researchers show was ...

A team of researchers recently discovered the kunga as the earliest example of human animal hybrid breeding. The animal was a cross between a female donkey and a male Syrian wild ass and was used to ...

A pair of eastern bluebirds. Source: Claudine Lamothe, via Flickr. Distributed under a CC BY-NC 2.0 license. Birdsong is often thought of as a male trait, but new research is changing that idea.