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Like us, they have Grandmothers. Post reproductive females that act as both supplemental carers and living databases. A 70 year old elephant is more likely to be post-menopausal than actively fertile.
Grandmothers live to be 80 or 90, allowing them to carry memories of what to do in a once per 70 year climate catastrophe. Which seems to be the magic number for African environments.
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