As well as fish suppers grey seals are also partial to a Harbour Porpoise dinner, according to new research.
Hundreds of mutated porpoises have been washing up on Dutch beaches over the last decade with no hint of a cause.
Back in 2012 Belgian researchers suggested that grey seals might be preying on porpoises. A year later a French research group published images of a swimming porpoise appearing to be under attack from a grey seal. However until now there has been no evidence the seals were actually killing the porpoises.
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