
Grandmothers Rule: Menopausal Mammals Revisited
From Itchy and Bitchy by Karen Nickell
January 17, 2026 · 15 min
About this episode
Karen Nickell discusses new research on menopause in chimpanzees and the grandmother hypothesis.
Karen Nickell revisits menopausal mammal, this time with brand new context: new research from Uganda’s Ngogo chimpanzees shows some chimps experience menopause too. She explains what makes humans evolutionary outliers, unpacks the grandmother hypothesis, and explores why certain toothed whales (like orcas) stop reproducing yet continue to live for decades. Visit our website itchyandbitchy.com to read blog posts on the many topics we have covered on the show.
People in this episode
Host: Karen Nickell
Topics covered
- menopause
- chimpanzees
- grandmother hypothesis
- toothed whales
- evolution
Keywords
- menopause
- chimpanzees
- grandmother hypothesis
- toothed whales
- evolutionary biology
Mentioned in this episode
Places: Uganda, Ngogo, orcas
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