For decades, researchers have debated whether or not animals make friends. “Friends” — the taboo “f word” — was generally put in quotes if it was used at all. But if you study the social networks of elephants, whales and other animals, it is clear that they have friends just like we do, according to Dr. Nicholas Christakis. Friendship, like other societal characteristics, evolved independently and convergently across species.

Co-Director of the Yale Institute for Network Science, Dr. Christakis is a leading Yale sociologist and physician known for his research on human social networks and biosocial science. In this episode, he speaks with us about the ancient origins and modern implications of our common animality and his new book, Blueprint: The Evolutionary Origins of a Good Society.