Bat night walks at Queen Mother's former Highland home
Two events forming part of the 20th International Bat Night are to be held at Castle of Mey in Caithness.
The castle near John O'Groats was the late Queen Mother's summer residence in the Highlands and continues to be visited by her grandson Prince Charles.
Bat walks, events where people use detectors to locate the mammals while they hunt prey, are to be held there on Friday and 16 September.
Highland Council Countryside Ranger Service has organised the walks.
International Bat Night is held to raise public awareness about bats and their behaviour.
Walks, talks and exhibitions are held, usually over a weekend late in August, though local groups are free to hold events on other dates.
So far, no other International Bat Night walks appear to have been registered further north than Castle of Mey.
Highland Council's Countryside Rangers Service said the Castle of Mey events would offer people the chance "to enjoy the most northerly bat walk in Europe, possibly the world".
Devices called bat detectors are to be made available to help the walk's participants locate the nocturnal mammals as they fly overhead and nearby.
"Wrap up warm and bring a torch," the ranger service added.