updated 08:47 AM EST, Tue July 07, 2015

"So have seals been attacking porpoises all along, without anybody really noticing? Or is this a relatively recent innovation in seal hunting tactics?"

You know seals as the flippered critters that balance balls on their noses for fish at the marine park. But the cute antics of the pinnipeds betray a deeper, darker secret. They're ruthless murderers and they'll stop at nothing to get a mouthful of delicious porpoise blubber.

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