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

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, ...

Same-sex behavior is widespread in primates and may help strengthen social bonds and improve survival under challenging ...

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

As a confessed evolutionist, I thought Nora S. Newcombe’s “Is Sociobiology Ready for Prime Time?” (The Review, December 13) was better than most critiques of sociobiology. However, I would disagree ...

The human body evolved over eons, slowly calibrating to the African savanna on which 98 percent of humankind lived and died. So, too, did the human brain. Evolutionary psychology is the study of the ...

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.

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 ...

Most pet behaviors are cute, but many of them may come from instincts developed by thousands of years of evolution. To learn more, put together a list of ways household pets have evolved as they’ve ...