As others have said, try to match your surroundings as much as possible. Let me give you a first had experience I recently had. During muzzleloader whitetail season here in Michigan, I decided one day to sit on the ground. We had a nice layer of about 5 inches of snow. I decided to wear my Saskatchewan whites (called that because when I sent hunting in Sask., I found out I needed pure white from shoulders to boots). Well, I didn't see any deer that evening, but an hour before dark I caught movement. It was turkeys and they were headed my way. I was sitting next to a fallen tree, but no other cover shielded me from their keen eye sight. They kept coming closer and closer. I kept my head tilted down and my eyes squinted so they couldn't see me looking at them. The entire flock of 17 walked up to me at 7 yards, went around the down tree, and right along side of me on the other side. They finally walked off from behind and had made a 270 degree curve right around me. They had no idea that I was there. I say all of this to remind you to attempt to blend into your surroundings..oh, and don't even twitch...lol.