Throughout the northern hemisphere, the dark cold months between November and February are the time when European starlings, Sturnus vulgaris, come together every evening into large flocks known as “murmurations”. Prior to settling in to their chosen communal sleeping site for the night, these birds perform a series of intricate aerial manoeuvres, where the flock repeatedly circles, and changes shape and density above their roost site for roughly half an hour each night.

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