Orca mothers forgo future offspring to care for their full-grown sons

North Pacific female killer whales hunt and share food with their adult male offspring.

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February 8, 2023

two killer whales

Killer whales from southern resident populations off the western United States and Canada

Whale Research Center/David K. Elifrit

Off the Pacific coast of the United States and Canada, orca mothers provide food for their sons long after they reach adulthood.

Orca, also known as killer whale (Orcinus killer whale), gives birth after 15 to 18 months of gestation and nurses the baby for about two years. However, only about one-third of pregnancies occur in Southern populations living off the coast of Washington and British Columbia …

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