Competition Pressured Killer Whales Into Menopause

Selfish daughters, not altruistic grandmothers, could explain the evolution of menopause.

Surviving beyond the end of your reproductive life is a rare trait: only female humans, killer whales, and short-finned pilot whales are known to do it. The question is why?

If the purpose of life is to pass on your genes, as evolutionary biologists suggest, then an end to reproductive ability—menopause—really just makes no sense. Read more in Hakai Magazine.