Thousands upon thousands of starlings swirl through the sky on their way home to their roost.
The incredible sight, seen in Norfolk and further afield, is called a murmuration.
Huge flocks begin to form at this time of year, as the birds more to winter roosting sites - often in towns and cities.
They've been observed in massive numbers in towns from King's Lynn to Great Yarmouth, as well as more rural areas.
According to the RSPB: 'It's basically a mass aerial stunt - thousands of birds all swooping and diving in unison. It's completely breathtaking to witness.
'We think that starlings do it for many reasons. Grouping together offers safety in numbers – predators such as peregrine falcons find it hard to target one bird in the middle of a hypnotising flock of thousands.
'They also gather to keep warm at night and to exchange information, such as good feeding areas.'
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