Zebra finches swing both ways.

Zebra finches are a monogamous species: they form life-long relationships and do not tend to stray from their mates. They are also known to form same-sex partnerships (like many birds, in fact), even in situations where males are present. In this study, the researchers observed pairing preferences in finches under different conditions. They found that in aviaries with equal sex ratios, about 6% of pairs were same-sex, primarily female-female. In a second experiment, they took same-sex pairs

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