- polarization / separation results in categorizing others out of our group identity. - xenophobia is an ingrained response - encounters occasionally escalate, validating the xenophobia, and increasing the separation.

https://www.science.org/content/podcast/chimpanzee-civil-war...

- It’s crazy to me how they have pictures of four chimps “hugging it out” one year and then four years later, three of them are killing the fourth.

- “The last offspring produced by a male and female that lived in different postfission groups was conceived in March 2015. After 2015, all offspring with known parentage were conceived by males and females from the same group… A few Central females and their dependent offspring occasionally joined Western chimpanzees at fig trees.” This is like when the Red Cross organizes family reunification events during conflicts.

— “For help organizing and analyzing spatial data and formatting final versions of the figures in R, we used Claude (models: 3.7 Sonnet, Opus 4, and Opus 4.5; Anthropic, 2025).”