A member of an angling club in Buckinghamshire has asked the RSPCA to investigate, after finding the severed heads of four swans.
Steaven Cooper, fisheries officer and secretary of the Beacon Angling Club, said he found the heads close to Mount Farm Lake in Milton Keynes.
He only found a swan's head and body in one instance and said he thought they might have been killed for food.
We have found four heads, and only one of them had the body close by it. That was near the Inn on the Lake pub, so the person may have been disturbed while doing it. As fisheries officer, I found them all, with bailiffs on the lake, over the last three weeks. I have tended to find them early in the morning. There is an area of the lake that is currently out of bounds for fishing, and I have found them in that area, which is quiet. The swans are friendly, and an easy target. I'm beginning to think that people are doing it for food.
He said it looked as if the birds' heads had been taken off by a sharp blade and he didn't think they had been killed by an animal. He said police had told him to contact the the RSPCA. Police had no information on the matter.