Visitors to the central London park say the hungry bird has taken to grabbing the pigeons by the neck before pulling them into the water.It is thought that the same seagull has been spotted on the banks of the Serpentine hunting pigeons and feasting on their remains for the past five years. Amateur photographer Johanna van de Woestijne, 57, was walking in the park when she witnessed its dramatic hunting technique.She said: 'It was one of the most violent things I have ever seen - after it happened I felt I had witnessed a murder.'I’ve seen him hunting pigeons on two separate days, both times he picked them off, dragged them into the lake and drowned them.'He is easy to spot as he has a distinctive look. He is fairly squat and looks muscular, like a bodybuilder. It must be the high meat diet he’s living on.'The aggressive bird wades into a crowd of pigeons, picks out a straggler, then sprints up and seizes it by the neck.It then drags its prey into the Serpentine and drowns it before eating it with his mate.Bird experts have said that the behaviour is extremely unusual for lesser black-backed gulls - which usually survive on a diet of small fish, aquatic insects and crustaceans.Birdwatcher, Ralph Hancock, 66, said he had been observing the menacing gull in the same spot for the past five years.'It is one of the strangest things I have ever seen a bird do,' he said.(dailymail.co.uk)Bakudaily.Az