Researchers have found that female orcas protect their sons -- but not their daughters -- in their later years. What the findings tell scientists studying the endangered Southern Resident orcas. FOX13
Photos of J Pod calfs taken under Federal Permits: NMFS PERMIT: 21238/ DFO SARA 388 Researchers studying the Southern Resident killer whales have found that female orcas protect their sons – but not their daughters – from fights with other whales in their post-menopause years.
A team consisting of researchers from University of Exeter, University of York and the Center for Whale Research were able to discover the benefit for male orcas through studying "tooth rake marks."Rake marks are a type of scarring left behind when a whale scrapes its teeth across another marine mammal, male orcas were found to have fewer marks whenever a mother was present that had stopped breeding.
Orcas live in close-knit groups, and are considered a matriarchal society. Female orcas lead groupings known as pods.
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