More than forty million Americans cherish their tail-wagging, face-licking, ball-fetching best friends. But not many people would welcome a wolf into their home. What makes dogs so uniquely friendly? Scientists have studied the unique relationship between humans and domestic dogs for decades, but the role... click to read more

Human friendships are often characterized by preferential intentions and attitudes including trusting expectations of close social relations. Humans largely trust only their friends with crucial resources or important secrets. In this study, we investigated whether chimpanzees show a comparable pattern and extend trust selectively toward... click to read more