skeet987, I can't explain every scenario. Best, I can do was already shown or explained above. A hunter has to do some figureing on his own. Once he/she has some basics.
When I was a young guy, we stalked Red Fox with our Greyhounds/staghounds, on the open crop hills. We either come in from down-wind or angling down-wind. Useing hills to conceal ourselves to get closer.
Might sound like BS, but we got got close to many Reds...many. Our sighthounds/Greyhounds could pick them out very well from long range let alone close range. Even when they/[fox] were balled-up sleeping & motionless.
Once our dogs ears perked up & they would stiffen & stretch their necks out. As they spotted their quarry. We'd say "sickem" & the chase would be on.
Red's have excellent eye-sight. But they are heavy sleepers, as compared to coyotes. That is there down-fall from hunters who stalk.
Once the coyotes moved in. They were much harder to get close to. Very alert, very wary as they are very light sleepers. They "rest" more than they so called "sleep". They are much warier of their surroundings as well.
Any subtle noise, perks their interest & gets their attention. Some moreso than others, but regardless they can pick out the faintest of noises, even in high winds. Their hearing & eye-sight is top notch.
Once the coyotes moved in. We then focused much more on the coyotes. Man what a difference, they were from the Red's. We played heck, even getting to within a 1/4 mile of a balled-up or resting coyote.
Over the yrs, as I became older. I tried different tactics to improve upon what I had learned from my Dad & his two buds. Not to mention, what I had personally learned/obseved.
One big improvment, was coming in from their angled up-wind.
I realized this tactic, was key to getting closer. No doubt, this up-wind angle, assisted in carrying my walk-in/stalk noise & scent. Parallel & down-wind, past a bedded coyote.
As I done it numerous times, over quite a few yrs. I still do it to this day.
As stated before, a hunter can't be quiet enough & stay hidden to be more successful.
Many of my pics were deleted due to my PC crash. I still managed to salvage some of them. EVERY predator pic, that is on my PC or on photobucket. All of those canines are facing a down-wind direction.
Adjust accordinly.