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Although its present in both sexes, testosterone is commonly known as the male hormone. Thats because males have more of it, and it strongly influences male sex traits and mating habits. Now, a study in birds shows that extra testosterone can give males a leg up in the mating game. However, there is an unfavorable tradeoff for this mating edge. This Science Update includes details about the research leading to this discovery as well as links to more resources for further reading.
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