Bonobos, like humans, cooperate with unrelated members of other groups
That behavior could help shed light on the evolution of cooperation between groups of people
![A female bonobo grooms a male from another group](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2023/11/111523_jb_bonobo-cooperation_feat.jpg?fit=1030%2C580&ssl=1)
An adult female in the Congo’s Kokolopori Bonobo Reserve grooms an adolescent male from a neighboring group of unrelated bonobos.
M. Surbeck/Kokolopori Bonobo Research Project