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

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

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