last year iam in my stand this guy comes walking up i whistle at him he stops and then starts walking rite towards me again i whistle again same thing he sits on a rock 20 yards from my stand so i yell at him (your not going to hunt write there are you) he about jumps out of his skin and says he didnt se me i had a flouro orange vest and hat on.i asked him if he heard me whistle he said he thaught i was a bird.