Can be anything that starts them off, our mate has a herd of bampots on an area we shoot. He calle dmy up asking us not to shoot as it was spooking them and they were stampeding about the place wrecking fences / dry stane dykes etc.
I went down to have a chat with him ,explaining that we shoot (with moderators) maybe 1 outing in 10 or so? We manage the deer very carefully on this farm, only taking the occasional beastie, sure, if we see charles, he gets nailed, anyway, as I am standing there talking to him, a cyclist goes past wearing a dayglow yellow top.......cue entire herd, they go fekkin