I went up into the Idaho mountains earlier this afternoon to do a video review of my UTV for my YouTube channel. I was in the area for about 2 hours and did not see another human. I parked at the trailhead, unloaded my UTV, and then proceeded up the trail for my video.
I went about half a mile and discovered that the area had been heavily logged and the trail destroyed. So I spent the next hour or so doing different takes, different camera shots, etc.
I returned back down to my 4Runner and backed the UTV onto the trailer and shut it off. As soon as I got out of the trailer, I hear a whistle about 15-20 yards away coming from the deep timber right behind the trail sign. This sounded EXACTLY like a human doing a quick whistle to get someone's attention.
My initial reaction was embarrassment that I was there for awhile and didn't see or hear someone approaching. I looked in that direction and expected a hunter or hiker to come out of the woods. But there was nobody there. I started strapping down the UTV nervously, with the hair on the back of neck standing up due to the feeling that I was being watched. I kept trying to process what I had just heard. Could it be someone messing with me? No vehicles in the area, and the only trail between my vehicle and the woods beyond was the one I just spent an hour on that was blocked off from the other end.
What's the chance that a human would be miles from his vehicle, 10 yards into the brush from a trail sign, just sitting there for hours waiting for someone to stop so he could whistle at them and not reveal himself?
What about an animal making the noise? I have heard every single animal and bird noise in these woods and have never heard an animal make a human sounding whistle. In my review video of the UTV, you can hear a very loud bird call in the woods. That is a very common bird call and I believe it is of a certain species of woodpecker. The whistle I heard was NOT a bird, or a fox, or a cougar, or a deer.
Here's my video of trying to figure out what it was...