The deaths of 16 birds of prey on the Black Isle earlier this year may have been accidental poisoning.
Police said yesterday that further investigations have revealed that the raptors were most likely not targeted deliberately but were victims of pest control measures.
Officers are continuing to appeal to the public for further information on the deaths of 12 red kites and four buzzards at various locations in Ross-shire in March and April this year.
A further four red kites and two buzzards were also found dead but it has not been ascertained if they were poisoned too.
The dead raptors were discovered in a small area south-east of Conon Bridge, around Conon Brae, Balavil, Leanaig and Alcaig.
Police found that 16 raptors had been killed by banned poisons, but no one has yet been charged in connection with the deaths, despite a reward in excess of £27,000.
A police spokeswoman said: “Following investigation police can now confirm that the birds, 12 red kites and four buzzards, were most likely not targeted deliberately but instead were the victims of pest control measures. The raptor deaths occurred over March and April this year.
“The criminal investigation into their deaths is still ongoing and Police Scotland continues to work closely with partners.”
Detective Superintendent Colin Carey said: “Investigations into the suspicious deaths of wildlife and especially raptors can be difficult and prolonged. The areas covered can be vast and it is seldom immediately apparent why a bird may have died.
“We work closely with partners to identify and thoroughly investigate all wildlife crime. The death of the raptors in Ross-shire remains an on-going investigation during which we are endeavouring to establish all of the circumstances around this crime. We would ask anyone who may have further information to come forward.”
Partner agencies are reminding members of the public that if anyone finds any further dead birds or animals in the area they are asked to make a note of its location and inform the police at Dingwall Police Station on 101. Under no circumstances should anyone touch or attempt to recover any dead animal.