Orcas live in stable, structured social groups. And their survival directly depends on it, as a CNRS and University of La Rochelle research team has just demonstrated. Between 1996 and 2002, half of the Crozet Islands orca population was killed off by an illegal fishing operation targeting Patagonian toothfish, with the orcas removing the fish from the line during hauling.
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Source: Phys.org