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Study: To Attract Female, Sing On-key

Want to attract a female? Sing! But make sure you warble on-key! That's one of the findings of a new study of male canaries, whose song quality and frequency change with the seasons. The male hormone testosterone plays a role in this changing behavior, and researchers at The Johns Hopkins University wondered how increasing the hormone levels in the bird's brain would affect the song. They used three groups of birds. One group received a testosterone injection in the POM - the...

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