Why Killer Whales Go Through Menopause But Elephants Don’t

Last summer, I met Granny. I was on a whale-watching boat that had sailed south from Vancouver Island, in search of a famous and well-studied group of killer whales (orcas). Two hours after we set off, we started seeing black fins scything through the unusually calm and glassy water. We saw a dozen individuals in all, and our guide identified them by the shape of their fins and the white saddle patches on their backs. Granny, for example, has a distinctive half-moon notch in her dorsal fin.

Seeing her, I felt an intense and solemn respect. She is the oldest member of the group, perhaps the ...

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