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总结
多家外媒援引一项汇总研究称，研究者在既有文献与观察记录中发现，数十种灵长类动物都出现过同性性行为，从山地大猩猩到猕猴等皆有报道，且不只发生在繁殖期。研究提出，这类行为可能用于建立联盟、缓解冲突、巩固群体关系等社会功能，并非单纯“异常”。论文还指出，在雄雌体型差异更大的物种中更常见，提示其可能具有进化起源与适应价值，但具体机制仍需更多野外与长期数据检验。
正文
Same-sex sexual behavior observed in dozens of primate species, suggesting evolutionary origin NBC News From Gorillas To Macaques, Same-Sex Sexual Behavior May Strengthen Social Bonds In Primates IFLScience Study finds widespread same-sex behavior among primates & could help explain why nature is so gay LGBTQ Nation Species in which males are much bigger than females - such as mountain gorillas - are more likely to engage in same-sex sexual behaviour IslanderNews.com Is there an evolutionary reason for same-sex sexual behaviour? New Scientist
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