Evolutionary stability and the rarity of grandmothering

  title={Evolutionary stability and the rarity of grandmothering},
  author={Jared M Field and Michael B. Bonsall},
  journal={Ecology and Evolution},
  pages={3574 - 3578}
Abstract The provision of intergenerational care, via the Grandmother Hypothesis, has been implicated in the evolution of postfertile longevity, particularly in humans. However, if grandmothering does provide fitness benefits, a key question is why has it evolved so infrequently? We investigate this question with a combination of life‐history and evolutionary game theory. We derive simple eligibility and stability thresholds, both of which must be satisfied if intergenerational care is first to… 

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