Matter: The Sex Life of Birds, and Why It?s Important

[unable to retrieve full-text content]Penis size and structure in birds varies widely, and research into how and why that happens ? the subject of recent criticism ? is providing valuable insights.

Source: http://www.nytimes.com/2013/06/06/science/the-sex-life-of-birds-and-why-its-important.html?partner=rss&emc=rss

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