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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

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