This is what I think takes place with the whitetail. Both bucks and does are taught by their mother at their very first day of birth about predators. Not man so much in particular, but coyotes, mountain lions(where they live), free roaming wild dogs, etc. I also think that over time, they are also taught about the many metallic sounds that man does make, vehicles (including 4 wheelers), talking, the placing of treestands, even the sounds and way that man walks through the woods. These scents are not a normal part of their surroundings. Those of us, including me that use automated feeders, which have a mechanical sound of their own, is not a natural sound also, that the whitetail is accustomed to in the woods. The last few days, I have had the opportunity to watch them in a pretty good size food plot. I could hear a vehicle going down the gravel road, and some of the deer stopped feeding and looked that direction for a few minutes, before they continued feeding. When the moon was full, back in October, just before leaving my stand for the evening, the deer were feeding in the middle of the foodplot, staying away from the edges. Nearly all of the pictures that I get on camera are at night also. I know that this is a long read, but that is what I have seen first hand. They are very on edge creatures, taught from birth, and as they procreate, they continue to teach their young.