![](https://static.scientificamerican.com/sciam/cache/file/48862897-A7E5-4284-8F2DB9C55B5EDD81_agenda.jpg?w=275&h=154&fit=crop)
Evolution
Humans Evolved to Be Friendly
Cooperation made Homo sapiens the last human species standing
Brian Hare is a professor of evolutionary anthropology, psychology and neuroscience at Duke University. Credit: Nick Higgins
Cooperation made Homo sapiens the last human species standing
In this excerpt from a new book, two canine intelligence researchers explain how dogs use barks to communicate
Support science journalism.
Thanks for reading Scientific American. Knowledge awaits.
Already a subscriber? Sign in.
Thanks for reading Scientific American. Create your free account or Sign in to continue.
Create Account