In nature, the vast majority of females reproduce until the last day of their lives. But there are exceptions so rare that scientists have spent decades studying them: orcas, elephants, and at least one more species of cetacean share with humans something that almost does not exist in the animal kingdom — the grandmother figure.
Older female orcas stop having calves and spend decades alongside their family. They lead food-search routes when food is scarce, guide the group in times of crisis, and remain caring for their grandchildren with a dedication that studies measure in a very concrete way: calves are more likely to survive if their grandmother is still alive. It is not a metaphor — it is data. In elephants, the oldest matriarchs play an identical role: their memory and experience are the most valuable resource the herd has.
Scientists call this the “grandmother effect”, and it is one of evolution’s most extraordinary adaptations. In Chile, about 28% of older people care for their grandchildren intensively. Perhaps we are not as unique as we thought. 🐋🐘
