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That is a threat face. Barbary macaque threat faces often appear with a brow raise, lowered head, and an o-shaped mouth, sometimes with and sometimes without a vocalization. Given the context you described it is not surprising the girl received a threat. *Based on personal research experience


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It looks like it is trying too threat. Source: Individual differences in scanpaths correspond with serotonin transporter genotype and behavioral phenotype in rhesus monkeys (Macaca mulatta)


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is this guess proven or affirmed by science? It is a debated topic. Such altruistic behaviors (toward non-kin) are extremely rare evolutionarily, with some theorists even proposing that they are uniquely human [1]. Experimental evidence indicates that human altruism is a powerful force and is unique in the animal world. [...] Current gene-based ...


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As the previous answers clarify, all organisms have heritable traits that may be manipulated through selective breeding. It is the pragmatics that can be prohibitively challenging. From an (zoo)archaeological point of view, few animals have actually been domesticated, and only recently in our species' history. The dog is an unusual case, perhaps domesticated ...


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This may shed light on why the teenagers response to dopamine changes. Quote from reuniting website There's much still to learn, but it looks like a number of reward circuitry events occur after climax that have the potential to desensitize us for a time. First, androgen receptors decline after ejaculation, and take up to seven days to normalize. ...


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Suggested Reads: Evolutionary Psychology By Lance Workman, Will Reader Evolution of Human Behavior: Primate Models edited by Warren G. Kinzey Social Behaviour of Children: A Cross Cultural Assessment By Ralph E. S. Tanner



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