A Capercaillie breeder has claimed that his birds are being damaged as a result of low-flying RAF jets.
Alistair Mackie, from Huntly, said the rare grouse are being spooked by the aircraft and in some cases are dying as a result.
He is appealing to the Royal Air Force to change their flight path.
The capercaillie is one of Scotland's best loved but most endangered birds, and it is estimated that the current UK population of the birds is just 2,200.
Mr Mackie breeds rare species of grouse at his home and hopes to one day reintroduce his birds back into the wild.
But he says his efforts are being hampered by low flying RAF jets.
He said: "We have had problems in early October and November last year, and into this spring with the jets coming over the house.
"Moreso in the evening when it gets dark and the birds get a fright - and this causes the damage.
"The worst thing is death but they can be frightened and spooked as well which can damage them.
"They have said they can't make an exception and avoid the property - the only exceptions are for wind farms and town centres.
"But given these birds are so rare surely they could fly 500 yards to the right or left and avoid the property."
It can take up to two years to rear a breeding capercaillie and Mr Mackie was devastated to find one of his adult birds had died after becoming startled by the noise of one of the jets.
It is understood the aircraft are from a base in the Scottish Borders.
Mr Mackie has written to the RAF explaing the situation and is asking for them to change the flight path.
He said he will continue to complain to the air force and hoped they will take notice of his efforts to preserve one of Scotland's wildlife treasures.
A spokesman for the RAF said: "Low-level flying is an essential and demanding skill that the Army, Navy and RAF aircrew must rehearse.
"The MOD is very conscious of the concerns of the public and makes every effort to limit disturbance to the community."
Last updated: 13 April 2009, 08:13
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