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Killer whale moms are still supporting their adult sons — and it's costing them

A new study finds that orca mothers still feed their adult sons. It's a bond that may come with costs, researchers say. (Center for Whale Research / NMFS research permit #21238)
A new study finds that orca mothers still feed their adult sons. It's a bond that may come with costs, researchers say. (Center for Whale Research / NMFS research permit #21238)

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