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Starling perform a murmuration at sunset near Gretna Green, in the south of Scotland. Picture Owen Humphreys/PA Wire
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Tens of thousands of starlings start their murmuration, with Criffel mountain in the background, as dusk falls near Gretna Green on the England and Scotland border. The reason for the beautiful spectacle is not definitively known, with theories ranging from a defense mechanism against predators to attracting more birds to join their roost.
A murmuration of starlings above the small village of Rigg, near Gretna, in the Scottish Borders on Tuesday