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...one type of killer whale, or orca, has been found to dine on an unusual dish: shark. But these 'offshore' killer whales of the northeastern Pacific pay a high price for their tough-skinned preference — their teeth become worn right down to the gums.
...From examination of dead stranded orcas and museum specimens, Ford found that the average offshore orca has worn its teeth right down, exposing their pulpy centres.
...it could be that older animals switch foods, says Baird — just as some humans switch to softer fare in later life.