Researchers have never fully understood why the phenomenon occurs only in humans and whales, since other species reproduce throughout their lives.


But now a study led by the University of Exeter in the UK has found evidence for what could be behind menopause in orcas: female animals stop reproducing when they’re older because their calves can’t compete with offspring born to their adult daughters.
In other words, a kind of mother-daughter conflict ensues when older orcas reproduce alongside their fertile daughters once they hit sexual maturity.


With only so much food and care to go around in the pod, calves born to grandmother-age whales don’t appear to survive as well as offspring born to younger mothers.
reasons here:http://www.thecliniq.org/2017/01/scientists-finally/

But why?

The reason is simple; because GOD made it so.

SFSNIPER:
The reason is simple; because GOD made it so.

god made it so but there is science behind it bro.....u dont believe in science?

That fallacy have been broken numerous time either by miracle or faith .

Okay.