Re: spotting animals at long range.
New to this site, but I thought I would chime in. I learned from the best so I thought I would pass it on.
There are many keys to spotting animals at long range.
Good optics. I use Zeiss 10x40 Classic. I like the clarity and they are comfortable in my hands. I used a pair of Redfield 10x50 for years before I could afford the Zeiss and my eyes appreciate the change.
Get comfortable. Don't plan on ever doing any real glassing while standing. Squat, lay, lean against your daypack and get where your arms will not get tired from spending a lot of time looking through your glass.
Have a plan to how you are going to look. I always look for the obvious first. Check the skyline, check the edges of openings where animals are likely to be during feeding times and look for obvious anomalies. After looking in the obvious places, start checking the timber or brush and look for patches of color. Sheep can be seen for miles at 10x just because of there big white butts. Elk always show up well against green or a snowy backdrop. Mulies can be hard to spot depending on the time of year, but should not be too hard in an arrid environment during the fall as they are mostly gray this time of year.
Be patient. When you are glassing from a good place, go back over it a few times. It is nothing for a whole herd to hid behind a small grove of trees.
Use a spotting scope only to clarify what you are seeing.
Practice. During mid-day when big game is typically holed up and hiding, see if you can spot smaller animals at long distances. If you can see a squirrel or rabbit at 1000 yards, you will be able to see a deer in the same area with no problems.