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Hormonal similarity makes happy couples, at least in birds


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Some people say that we become more like our partner as time goes on. Surprisingly, the same seems to be true in the animal world -- studies on compatibility between mates show that individual animals are more successful when they behave in a similar fashion to their mate. New research shows that mating pairs of the bird species known as great tits become more similar in their hormones over time.OXg7QLePgN0

 

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