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Earlier researchhas suggested that postmenopausal orcas are thought to boost the life chances of their offspring and grandchildren — known as the grandmother effect. The head of a killer whale pod shares her knowledge of the best hunting spots and more than half the fish she catches with her family members.

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In a group of orcas, known as theSouthern Resident population, that lives off the Pacific Northwest coast of North America, scientists studied “tooth rake marks” — the scarring left when one whale scrapes their teeth across the skin of another.

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Orcas have no natural predators — except humans — and the tooth marks on their skin can only be inflicted by other killer whales, either within social groups or when two pods meet.

“Tooth rake marks are indicators of physical social interactions in killer whales and are typically obtained through fighting or rough play,” said lead study author Charli Grimes, an animal behavior scientist at the Centre for Research in Animal Behaviour at the UK’s University of Exeter.

It was possible older females used their experience to help their sons in encounters with other whales, Grimes said. The team is collecting drone footage of the whales to better understand the behavior.

“We think that these females use their enhanced knowledge of other social groups that obviously comes with time (and) experience … to help their sons navigate the interaction — whether that is signaling to them vocally or behaviorally,” she said. “That’s one hypothesis of how they might be protecting them. Another one is that they involve themselves in a conflict if a fight looks risky (for their son).”

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“We can’t say for sure why this changes after menopause, but one possibility is that ceasing breeding frees up time and energy for mothers to protect their sons,” Grimes said.

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“Males have the opportunity to mate with multiple females, and they do this outside of their own social group. When a male’s calf is born … then the cost of that calf lies with the other group,” she said.

Only humans and five species of toothed whales are known to experience menopause, the new study noted. However, anAugust 2021 studysuggested that the grandmother effect may also occur in female giraffes, who live long beyond their reproductive years.

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