Testosterone turns male juncos into blustery hunks -- and bad dads

The ability to ramp up testosterone production appears to drive male dark-eyed juncos to find and win mates, but it comes with an evolutionary cost. Big fluctuations in testosterone may also cause males to lose interest in parenting their own young, scientists have learned.

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<p><a href="http://www.physorg.com/news111664686.html">Testosterone turns male juncos into blustery hunks -- and bad dads</a></p> <p>The ability to ramp up testosterone production appears to drive male dark-eyed juncos to find and win mates, but it comes with an evolutionary cost. Big fluctuations in testosterone may also cause males to lose interest in parenting their own young, scientists have learned.</p>