This is the flight path of a flock of birds over time

Xavi Bou is a Spanish photographer who embarked on a project called Ornitographies in 2012. In order to “to make visible the invisible,” he creates timelapse pictures of birds in motion.

Bou says that he feels like a curator looking for hidden drawings that birds make in the sky with their flights.

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One of the favorite birds are clouds of starlings when they do their murmuration dance, especially when this group is behind attacked by hawks, as Bou says in an Atlas Obscura article: ”I am passionate about the idea of how a sculptor, the hawk, shapes the shapes of starling clouds“, he says.

https://en.wikipedia.org/wiki/Xavi_Bou