This is one of the best posts I have come across. Many. many great points .... using wind, using terrain, moving extremely slowly , using binos to help spot details, etc. After my grand dad suddenly died when I was 10 or so, one of my families best friends who was also elderly sort of became my substitute grand dad, gave me a piece of advice that has served me well over the years. He dearly loved squirrel hunting and had two great little treeing terriers. The dogs treed one in a big old pine and try as I might I could not find the squirrel .... Mr. Herman told me to look for "what ain't tree". And lo and behold I spotted the squirrel withing a few looks, a "hump" on a limb. So, when I still-stalk hunt I look for what ain't deer. If you have never tried this approach, give it a shot. It works for me.