The RSPCA is to investigate the finding of four severed swan heads in Milton Keynes and is urging anyone with information to come forward.
Three of the four bodies were missing, which raises concerns that the swans may have been killed for food.
Mr Cooper said: “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.
“It doesn’t look like it was done by an animal, it was a sharp blade that took the heads off. I have seen animals kill, and it does not look like that.”
The animal welfare charity were contacted yesterday regarding the discoveries and will be investigating the case further.
A spokesman said: “The RSPCA was contacted yesterday and will be looking into these attacks.
“In the majority of such cases, the causes are animal predation, but until we have seen the bodies we won’t be able to comment on the exact cause of death.”
The RSPCA is urging anyone with information to call 0300 1234 999.