Menopausal killer-whale grandmothers vital for survival of the species

Killer whales have been found to share “the grandmother effect” that humans experience – where menopausal grandmothers have a significantly beneficial effect on the reproductive success of her children and the survival of her grandchildren.

The grandmother effect is thought to explain why mammals continue to live a long time after becoming infertile.

Source: Menopausal killer-whale grandmothers vital for survival of the species

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