I've seen London birds flocking in the same way, also just before sunset. The most amazing part was how the entire flock would dive into a tree at full speed and disappear, presumably all perched on twigs. Then 10 seconds later they would all zoom out of the tree at full speed in one mass, do a few crazy high-speed turns still all as one unit, and then dive into another tree at full speed. They repeated this dance over and over, every time with a different route. It was fantastic to watch.
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If you don't do it properly, you'll get to the pub sooner.
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