Five rare white killer whales spotted together in a sign of dangerous inbreeding: 'To have five – or up to eight – in one area of the Russian north-western Pacific, is an indication that there may well be inbreeding issues there'

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Five rare white killer whales spotted together in a sign of dangerous inbreeding: 'To have five – or up to eight – in one area of the Russian north-western Pacific, is an indication that there may well be inbreeding issues there'