An orca is spotted near the Norwegian city of Tromso in the Arctic Circle in January. Photo: AFP

Doting orca grandmas help raise young killer whales

  • Researchers study first non-human example of the ‘grandmother effect’, where post-reproductive females assist other members of species with their offspring
  • Calves whose maternal grandmother died within last two years had mortality rate 4.5 times higher than those with living grandmother
Topic |   Animals

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An orca is spotted near the Norwegian city of Tromso in the Arctic Circle in January. Photo: AFP
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