St Cyrus National Nature Reserve fears for its wildlife after piles of a substance resembling rat poison were found on the cliff paths.
The Review understands that this type of activity has happened before several times over the past few years but the perpetrator(s) has yet to be caught.
Therese Alampo, manager of the Scottish National Heritage nature centre at St Cyrus, said: “Police Scotland have been notified again.
“However, we really want to stress how important it is to keep dogs under close observation on and around the cliffs.
“We don’t think the poison is aimed at birds of prey because that tends to be concealed within a carcass of some sort.
“People should remain vigilant in case there are other piles found on the reserve.
“The last time this happened a dog ingested some of the poison and unfortunately had to go to the vet with internal bleeding.”
Police Scotland confirmed that investigations into the incident are ongoing.
If anybody sees any suspicious looking substances on the St Cyrus reserve or in other public places around the area please call Police Scotland on 101.
The Royal Society for the Protection of Birds (RSPB) advises: “These products are also toxic to other wildlife, domestic livestock and pets.
“A failure to adequately protect baits from access by animals and humans (particularly children), and not complying with other instructions on the product label, can lead to a prosecution.”