What is historically the UK's longest lasting patch of snow has disappeared for "only the eighth time in 300 years".
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Dubbed the Sphinx, the patch on remote Braeriach in the Cairngorms has melted away more frequently in the last 18 years.
Snow patch expert Iain Cameron said climate change was a likely factor.
According to records, the Sphinx previously melted fully in 1933, 1959, 1996, 2003, 2006, 2017 and 2018.
Before 1933, it is thought to have last melted completely in the 1700s.
The Sphinx had shrunk to the size of an A4 piece of paper in recent weeks before finally disappearing in mild weather.
Stirling-based Mr Cameron has been studying snow patches in Scotland for 25 years and is author of the book The Vanishing Ice, which he describes as a "lament" to snow and ice that lingers high in Scotland's hills.
He worked alongside the late Dr Adam Watson, a biologist dubbed Mr Cairngorms because of his many years studying the mountains.
Some of Dr Watson's research on the Sphinx drew on information handed down by generations of people who worked and visited the Cairngorms, which suggests the patch may have only melted a few times in the last 300 years.
From the 1840s the Scottish Mountaineering Club began noting the fortunes of the patch, and more recently scientists and ecologists have gathered information.