Starling murmurations are some of nature's eeriest and most impressive displays. But something about the in-flight behavior of this geometrically synched flock in Scotland is particularly transfixing.

Though the phenomenon is well recorded, scientists still don't know precisely why, or even exactly how, starlings mange to pull off their mysteriously synchronized flights. But — as illustrated in this timelapse of starlings flying in and out of formation over the course of an evening in Gretna Green, pointed out to us by Kinja-user Igpajo — they're pretty hard to look away from.