他们商定，孩子们与父方母方分别各住两个星期。
They had an arrangement that the children would spend two weeks with each parent.
但是，这一点很重要，它们的繁殖量与那些只有父方抚养幼儿的鸟类的数量相当。
But, and this is important, their clutch volumes matched those of birds that have only male parental care.
Hsueh博士说：部分原因可能是因为母方和父方基因的冲突。
Dr Hsueh suggests that part of the answer may lie in a conflict between maternal and paternal genes.
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