The Importance of Reciprocity in Chimpanzees

De wall has documented that in some brutal detail in his multiple books on the emergence of morality and chimpanzees. chimps are very very strong and they're hunters and they have very powerful teeth and they tear each other apart so when two subordinate chimps decide they'd have it enough they've had enough and they go after top tyrant it's not a good day for him. If you happen to be a male chimp and you're pretty good at reciprocity and you have like a bunch of allies then you know you're sort of part of a nice chimp gang.