At work, thanks to all the windows and being on the fifth floor, we have a fairly panoramic view of the area. And every afternoon, usually soon after 3pm, though sometimes as late as 5pm, a murder of crows comes to roost in the trees around the building. Sometimes there is just a few, other times it looks more like 100 (can’t say that doesn’t make us a bit nervous…).
They stick around for a few minutes, then just fly off en masse. When they’re there around sunset, the effect is quite striking.