Size matters... if you're a rodent

Promiscuity is common among female rodents, leading to competition between the sperm of rival males over who fertilizes the eggs. It now seems that possessing a longer penis may give males an advantage in this competition, according to new research to be published in the March issue of The American Naturalist.

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<p><a href="http://www.physorg.com/news91864464.html">Size matters... if you're a rodent</a></p> <p>Promiscuity is common among female rodents, leading to competition between the sperm of rival males over who fertilizes the eggs. It now seems that possessing a longer penis may give males an advantage in this competition, according to new research to be published in the March issue of <i>The American Naturalist</i>.</p>