One technique that is very interesting that I don't think gets used enough is two people hunting very close together.
It is hard to quietly walk up on most animals All of us that spend anytime in the woods can pick out the animal making the noise before we see them most of the time. A two legged turkey sounds lots different than a four legged deer for example. I think two people could very effectively walk more like a deer than a two legged human with little practice and a bit of thought.
As an example one year elk hunting, my buddy and I walked out at night side by side and we walked right up on one bugling elk that we could barely see. We thought it exciting and fun and kept walking. Five minutes later, still walking out, another elk ran right up on us, thinking we were - that elk. All it could hear was us steadily walking on a grave bar.