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In Killer Whales and Humans, Older Moms May Be Best.

The researchers didn't find any direct benefit of menopause for mothers (or grandmothers), but they did find an impact on the survival of calves: Calves born to older mothers had a 10 percent higher survival rate than other calves.

"We found that the oldest mothers may also be the best mothers," Ward said. "Older females may be more successful in raising young because of maternal experience, or they may allocate more effort to their offspring relative to younger females," which are splitting their attention between their calves and mating.


*snickers*

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