Killer whales live on after menopause to protect sons

The wonderful world of whales - Females give birth in their thirties but can live for a further 50 years after having their offspring.

Scientists from the University of Exeter used long-term records to identify possible reasons for this long non-reproductive phase of life.

They found that the presence of mothers ensured greater survival of adult sons to breeding age.

The findings are published in the journal Science.

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