The birds were initially spotted in the sky by a passer-by, who returned to the road around an hour later and found them all dead. "My gut instinct is that they have been poisoned, but we don't know. It is hard to say really." The couple have contacted the police and the Animal and Plant Health Agency who they say are looking into the incident. "We are keen to ensure the incident is investigated by the authorities, but for the time being it is important not to speculate on the cause."