Bird Moms Manipulate Birth Order to Protect Sons

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A mated pair of house finches (Carpodacus mexicanus) perform an aerial display. The red-breasted bird is the male.Copyright 2005 Alex Badyaev
A mated pair of house finches (Carpodacus mexicanus) perform an aerial display. The red-breasted bird is the male.Copyright 2005 Alex Badyaev

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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