<< Modern humans live in an “exploded” network with unusually large circles of trust that form due to prosociality toward unfamiliar people (i.e. xenophilia). In a set of experiments [AA] demonstrate that semi-free ranging bonobos (Pan paniscus) – both juveniles and young adults – also show spontaneous responses consistent with xenophilia >>
Jingzhi Tan, Dan Ariely, Brian Hare. Bonobos respond prosocially toward members of other groups. Scientific Reports 2017; 7 (14733). doi: 10.1038/s41598-017-15320-w. Nov 7, 2017.
https://www.nature.com/articles/s41598-017-15320-w
Robin A. Smith. Bonobos Help Strangers Without Being Asked. Humans aren’t the only species eager to make a good first impression. Nov 7, 2017.
https://today.duke.edu/2017/11/bonobos-help-strangers-without-being-asked
https://www.sciencedaily.com/releases/2017/11/171107122904.htm