On four occasions , grey seals were spied eating porpoises they had killed . Although killer seas are known to lurk in the waters off the continent , this is the first time they have been seen around Britain . The animals can be found on both sides of the Atlantic Ocean and it has long been thought that their numbers may be declining due to overfishing or pollution from human activity.
On four occasions , grey seals were spied eating porpoises they had killed . Although killer seas are known to lurk in the waters off the continent , this is the first time they have been seen around Britain . The footage , the first in the world , was shot by a wildlife cruise company , off the coast of Pembrokeshire .