These birds flock in mesmerizing swarms of thousands—but why is still a mystery. – National Geographic

Its a mesmerizing sight: Thousands of birds move in unison through the evening sky, whirling and swooping as if performing a highly synchronized ballet.
When they finally descend to their treetop roost, the beating of their iridescent wings creates such a rush of sound that the noise earned the phenomenon its unusual name: a murmuration of starlings.
The term is unique to European, or common starlings, one of the worlds most abundantand adaptablebirds. Native to the United Kingdom as well as Europe,…

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