Bonobos, when abruptly interrupted in a social activity with another bonobo, resume it as soon as the interruption is over with the same partner. This ability—the feeling of mutual obligation when interacting—has previously been assumed to be unique to humans. However, a study conducted at the University of Neuchâtel has just demonstrated its existence for the first time in the natural interactions of bonobos. It is published today in the journal Science Advances.