Unlocking the secrets of Cairngorms snow
The snow that survives all summer on Scotland's mountains has long proved to be a source of fascination for hill walkers and climbers.
Heavy snowfalls on high ground last winter helped ensure a record season for summer snow hunters, who are now using new drone technology.
BBC Scotland's environment correspondent David Miller reports from the Cairngorms.
Follow @BBCDavidMiller on Twitter.
Aerial footage courtesy of Iain Cameron
23 Sep 2014
- From the section Scotland