Higher Primates & Certain Bats

This might seem rather disrespectful. 
In fact, it's sibling rivalry at its evolutionary best. 
You see, mother and fetus 
have quite distinct evolutionary interests. 
				The mother 'wants' to dedicate 
				approximately equal resources 
				to all her surviving children, 
				including possible future children, 
				and none to those who will die. 

The    fetus    'wants'    to    survive,    and    take    as    much    as    it    can    get.






Found in Susan Sadedin’s answer to the question,
“What is the evolutionary benefit or purpose of having periods?”

-Published in Persephone’s Daughters, Issue 3.