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There is not one kind of 'good sperm' -- it depends on other qualities in the male, bird study shows

There is not one kind of 'good sperm' -- it depends on other qualities in the male, bird study shows

In a new study, researchers show that the same type of sperm is not always the best for all male birds. Depending on how attractive or dominant you are you might be more successful with longer or shorter sperm.

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