Similar sized sexes
Although not as obvious a human trait as some of the others, a reduction in sexual dimorphism - the difference in size and shape between males and females - is closely linked to one of the most important human features of all: widespread cooperation in a population.
High sexual dimorphism in most primates is associated with competition between males for access to females. Most commonly, this leads to males having much larger bodies and canine teeth, which are used in displays of aggression.
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