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Why killer whales—and humans—evolved menopause

Grandmother knows best — Grandmothers help to explain an evolutionary mystery. Cathleen O'Grady - Dec 16, 2019 3:52 pm UTC Enlarge / Southern Resident killer whales, an endangered population that recently lost the oldest known grandma orca to date.There's a rare human trait that doesn't often make it into debates about what makes our species…

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