Chewed-up orca fins on Russian beach point to cannibalism, and scientists say it may explain why some pods are so tight-knit Live ScienceCannibal killer whales a sign of evolution in action Oceanographic MagazineRussian killer whales locked in bloody clan wars turning to cannibalism to survive dailystar.co.ukAre these killer whales cannibals? They probably don’t think so themselves Phys.orgSevered Fin Reveals Rare Killer Whale Cannibalism and Questions the Differences in Orca Species Discover Magazine