Nonhuman primates like bonobos and chimpanzees might engage in same-sex sexual activities to strengthen bonds, particularly ...

More than 59 different primate species have been observed participating in some kind of same-sex behaviors, making it extremely common.

Homosexual behavior in primates has a deep evolutionary basis and is more likely to occur in species that live in harsh environments, are hunted by predators or live in more complex societies, ...

As animals go about their lives ― eating, fighting, having babies ― they don’t always follow the script laid out for them by ...

While many studies have looked at possible evolutionary links between men's strength and sexual behavior, a Washington State University study included data on women with a surprising result. Women, as ...

Many primate species have been observed engaging in same-sex sexual behavior. A new study suggests it likely developed evolutionarily to help reduce conflict and build bonds.

Biologists tend to look at the animal kingdom and try to categorize things in an organized fashion. But nature has a way of defying our neat little categories. Take something as common as same-sex ...

The study of animal behaviour in ecological and evolutionary contexts examines how behavioural traits develop, persist and interact with environmental challenges. Research in this field investigates ...

Scientists have long wondered whether evolution would follow the same path if history had a chance for a “do-over.” New research suggests that it does, when it comes to the brain and its regulation of ...

Introduction: The characterization and evolution of lizard behavior / Vincent L. Bels and Anthony P. Russell -- Part I. "Everyday" behavior. Chapter 1. Behavioral thermoregulation in lizards : ...

Introduction : Why teeth? -- I. Development. Microscopes, cells, and biological rhythms -- The big picture : birth, death, and everything in between -- Things that can go wrong : stress, pathology, ...