I listen at the end of the bugle, for that raspy throaty sound, hard to exactly explain how it sounds...i can usually tell if its human or wapiti,most of the time if itis human, they will usually throw out a couple of cow calls, alot of times being those discrepency hoochie mamas, which is like telling the difference from your head and a hole in the ground. This year i noticed when i would hear a bugle, then shortly after i would hear a 4 wheeler start up, go aways and bugle some more, not even get off of there 4 wheelers, NOW that is HUNTING!!!So annoying! I quit hunting that canyon!!!