Murder of Crows from Dennis Hlynsky on Vimeo.
Dennis Hlynsky, who teaches at RISD, has a number of these small films on his website. His post, 'murmuration of starlings' outlines how he does it all technically.
After watching these videos for a while you start to recognise slow hops from wire to wire and swift flashes across the sky. Presumably each trail is visible for the same time in these films – clearly some birds are lazy little laggards. Or maybe just tired.
data in data out from Dennis Hlynsky on Vimeo.