Killer whale grandmothers boost survival of calves: Post-menopausal killer whale grandmothers improve the chances of survival for their grand-calves

New research finds that killer whale grandmothers who were no longer able to reproduce had the biggest beneficial impact on the survival chances of their grand-offspring. This may be because grandmothers without calves of their own are free to focus time and resources on the latest generation, the researchers suggest.

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