Bird Moms Manipulate Birth Order to Protect Sons

According to a new study by scientists at the University of Arizona, female house finches are able to change their hormonal makeup to ensure male birds hatch later, grow faster and spend less time in the nest than their sisters.

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<p><a href="http://www.physorg.com/news77909154.html">Bird Moms Manipulate Birth Order to Protect Sons</a></p> <p>According to a new study by scientists at the University of Arizona, female house finches are able to change their hormonal makeup to ensure male birds hatch later, grow faster and spend less time in the nest than their sisters.</p>