Porpoise Killing Seals…Dramatic New Behaviour!

Fascinating seal behaviour – who knew??

Deep Blue Conversations

Scientists have discovered through DNA analysis that harbour porpoises (Phocoena phocoena) that have washed up severely mutilated and dead along the Dutch as well as the Belgian and northern France coastline beaches with an unknown cause of death and mutilation were actually attacked by grey seals (Halichoerus grypus). This is a new behaviour for the normally fish eating mammals.

Grey Seal. Image via www.theanimalfiles.com Grey Seal. Image via http://www.theanimalfiles.com

Two different papers came out this past month (Leopold et al and Jauniaux et al) confirming this behaviour in the North Sea though DNA analysis (as well as a Note in Marine Ecology Progress Series on the ability to extract usable DNA from bite wounds). By collecting swab samples from bite marks on washed up harbour porpoises scientist were able to confirm that the injuries and death had been inflicted by Grey Seals.  Along the Dutch coastline 721 of 1,081 stranded porpoises were examined by Leopold et al between…

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