https://www.yalescientific.org/2012/03/do-animals-exhibit-homosexuality/
https://www.cambridge.org/jp/academic/subjects/life-sciences/animal-behaviour/homosexual-behaviour-animals-evolutionary-perspective?format=HB&isbn=9780521864466
https://www.imperial.ac.uk/news/190987/scientists-explore-evolution-animal-homosexuality/
いくらでもあるぞ
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