I think i am seeing the same effect from useing my high-powered pellet rifle. A couple of days of some very close misses, and they seem very leary of coming back. One came back the other day and just stood on the bank looking around . Like he was expecting the worst \:\) I basically aim at the head,knowing there is no way i could hit that small of a target. Now the only time we have seen them is very early in the morning. I think they know i'm not an early riser! There are exceptions to that, which they shall understand shortly