Post-menopausal killer whales protect their adult sons from fights, research shows.
, scientists used photographs of orcas in a population that lives off the Pacific coast of North America. Ms Grimes and her colleagues found there were far fewer "socially inflicted injuries" on the bodies of male offspring which were with their mothers, but only when they were post-reproductive.The work is part of long-term research on these "southern resident" killer whales.
Female killer whales live up to 90 years in the wild, and most live more than 20 years after menopause. They give particular attention to their sons. "Males can breed with multiple females, so they have more potential to pass on their mother's genes," explained Ms Grimes.The dorsal fin of an adult male orca showing tooth rake marks from a fight
"These sons are really reliant on their mums for their survival," said Ms Grimes. "Mothers will even directly feed their sons salmon that they catch.
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