Nature is also gender biased!

This is with refernece to round worms only...But even so natures law is survival of the fittest ! This is true of all living beings, we see it in animals,plants and human beings as well...

It is revealed that females of some species die soon after giving birth.

http://www.deccanherald.com/content/375935/some-females-do-die-males.html

When it comes to nature, there is no gender bias. It's the nature's law. Every living organism has its own life span.

Giving birth to a new life needs lot of energy and power. Such strength and power is within a female sex. However it may be the nature of few species to die after giving birth. She may not be able to tolerate the pain.