The RSPCA is appealing for information after a red kite and a buzzard were found dead, with a body of a pheasant between them in Hereford, on 20 August.
The three birds were found within feet of each other at a farm in Pontrilas and were taken to a vet by the farm’s owner.
The vets could find no obvious signs of injury or disease but it is thought that the deaths may be suspicious.
“Whilst we don’t know the exact causes of the deaths, it is very unusual to find dead birds like this so near to each other," said RSPCA inspector Sarah Chambers.
“It may be that they were poisoned or that there was something in the pheasant that has then caused the deaths of the birds of prey if they tried to feed on it.”
Under the Wildlife and Countryside Act 1981 not only is it illegal to kill or poison a wild bird and those responsible could face a maximum six months in prison and/or a £5,000 fine.
Anyone with information should contact the RSPCA inspectorate information line on 0300 123 8018.