In the coastal wetlands of southwestern Denmark, where some starling flocks in spring can number more than a million, locals term their late-afternoon displays “black sun” because they literally darken the sky.
One writer says, “In murmuration, each bird strives to fly as close to its neighbors as possible, instantly copying any changes in speed or direction. As a result, tiny deviations by one bird are magnified and distorted by those surrounding it, creating rippling, swirling patterns.”
Some feel it is a maneuver to avoid a predator such as an attacking hawk.
And whoever thought of the word murmuration, anyway? It comes from the Middle English – ‘the act of murmuring: the utterance of low continuous sounds or complaining noises.’
You can experience the sometimes low and sometimes deafening murmuring in the video.