https://www.sciencedaily.com/releases/2013/10/131017135206.htm
Marmoset monkeys know polite conversation | ScienceDaily
Humans aren't the only species that knows how to carry on polite conversation. Marmoset monkeys, too, will engage one another for up to 30 minutes at a time in...
marmoset monkeyspolite conversationknowsciencedaily
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