Ever heard of the "sixth sense"? I've given this phenomena a lot of thought over the years. I have experienced this many, many times. But, it doesn't always end in a kill. It does at least end in a close encounter. I think it comes from a lot of time in the woods and getting "in tune" with nature. I think that the sixth sense comes from all of the well-known five senses combining into a single highly-tuned, primitive sensory force. Ever been in a dangerous situation, that in and of itself didn't seem dangerous, where your hair and skin got goose bumps? That's the survival aspect of the sixth sense.
The day after Christmas 2000, I was hunting with "Bear" Dunn, who owned Trax America, the maker of the Grizzly deer stands. We were at his club behind the levee at Tunica for a few days of hunting. The first morning hunt it was 25 degrees at daylight. Even though I had seen more than 30 deer in a big food plot 300 yards away the evening before, that morning I saw zilch. I sat there huddled against the cold until well after 8:30. Suddenly, I got an overwhelming feeling that I needed to stand up, turn 180 degrees and get ready. I listened to the feeling. I stood and scanned the woods behind the sycamore for only a few seconds when a 3-year-old 8-pointer stepped over a log and into view about 80 yards away. No hesitation. The Model 7 was already to my shoulder. All I had to do was cheek the rifle and settle the crosshairs.
I've had similar experiences several times.