In pictures: Starlings put on aerial show over Gretna

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image captionThe skies over Gretna in southern Scotland have been filled with a spectacular display on recent evenings.
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image captionThe birds are regularly seen in the area, particularly at this time of year.
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image captionTheories about the gatherings - known as murmurations - include safety in numbers, keeping warm or exchanging information about feeding areas.
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image captionThe birds often appear to form into recognisable shapes on the horizon.
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image captionThe area near the Scotland-England border has become a regular gathering point.
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image captionMurmurations can see up to 100,000 birds gather and take place all over the UK.

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