If it helps, I was in NM last week and took a long hike trying to locate some elk. My dad had planned on picking me up a few hours later a few miles down the road. As I was getting closer, he started bugling every now and than to let me know where he was. In between bugles, he was cow calling. He probably only bugled 3-4 times over a course of 30 minutes. As he was waiting, a 5x6 came in within 12 yards of him, never made a peep. For that matter, nothing was talkingthe entire 5 days I was there. So yes, they will come in and they will come in silent a times.