Killer whales live on after menopause to protect sons (BBC Nature News, 13 September 2012)

A study by UK and Canadian researchers published in Science suggests that male killer whales over 30 years of age have a massively increased risk of death for the year following the death of their mother. The findings suggest that the mother's menopause occurs early, perhaps up to 50 years before her death, to allow the mother to ensure her son's survival to breeding age.

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