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Same-sex pair-bonds are equivalent to male–female bonds in a life-long socially monogamous songbird

BiologyBreeding BehaviorReproduction ResponseFitnessMonogamous SongbirdNatural SciencesSocial BehaviorEvolutionary BiologyGender StudiesSexual SelectionSex DifferenceSexual BehaviorAnimal BehaviorSocial SciencesSame-sex Pair-bonds