Chris Foote 10 hours ago
The young hen harrier's tag stopped responding on the border of the Cairngorms National Park.
A satellite-tracked bird of prey has vanished in the Highlands for the fifth time this year.
The young hen harrier's tag stopped responding on the western border of the Cairngorms National Park last month.
It follows the disappearance of another harrier on August 3 and the loss of three golden eagles in the nearby Monadhliath mountains.
Brian, who went missing on August 22, was last seen a few miles from Kingussie and his body has not been found.
The Royal Society for the Protection of Birds said there was no sign of any problems with his tracker before it went silent.
A spokeswoman for the animal charity said: "Brian was tagged on July 4 on an estate in Perthshire within the Cairngorms National Park.
"He fledged from the nest and stayed close to the nest site until the beginning of August when he moved north into southern Inverness-shire.
"Brian then spent the next few weeks over various areas of managed grouse moor within the National Park with frequent strong, clear transmissions from his tag providing detailed information about his daily travels.