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Study shows same-sex sexual behavior is widespread and heritable in macaque monkeys

  • Homosexual behavior is widespread among male macaque monkeys in the wild, and it may provide evolutionary advantages such as strong male alliances and increased access to females.
  • In a study on a colony of rhesus macaques in Puerto Rico, researchers found that 72% of males engaged in same-sex mounting, while only 46% mounted females. Same-sex mounting was found to be heritable, with genetics accounting for 6.4% of the behavior.
  • Contrary to previous beliefs, same-sex behavior in male monkeys did not negatively impact reproductive success.
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Newsweek broke the news in United States on Monday, July 10, 2023.
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