Beetles have been massing to mate on the top of Scotland's most southerly Munro.
People climbing 3196ft Ben Lomond, on the eastern shore of Loch Lomond, have reported thousands of longhorn beetles on its summit.
National Trust for Scotland ranger Fraser McKechnie, who was carrying out path repair work on the hillside at, said: "The two-banded longhorn beetle has an annual lek [when male species display courtship behaviour] of sorts on Ben Lomond. It seems to head for the summit when the sun shines.
"Lots of folk were complaining of masses of cleggs on the summit. It was of course, our friend, the harmless longhorn."
The same phenomenon has been observed at other sites across Scotland and in Wales and the Lake District. It is thought to be caused by high pressure bringing updrafts to carry the insects from wooded valleys up the hills.
The two-banded longhorn beetle (Rhagium bifasciatum) can reach 22 millimetres (0.87 in) long and has two prominent pale yellow bands on each of its wing cases.
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