Think similar vision to yourself, but with enhanced movement capabilities, and diminished still capabilities (black and white). This last season I spent 7 hours going about 2 miles to cross the drainage I had spotted the elk in, high enough to keep my scent above them. The last 1/3 mile had little cover and took about an hour, and the 600 to 400 yards (45 mins) was an excruciating creep across the open hillside that had a few bushes and burnt deadfall. I was literally moving like molasses and was able to stay in the shade mostly, which helped. I had about a dozen elk looking about (heavy wolf area) and, so of course I didn't move when they looked my way, but they were spread out in big willows and fir trees, so I couldn't see but about 5 at a time. Mostly, I didn't have anthing else going on, and I wanted to see if I could pull it off.
After crouching on the steep hillside until my legs went crazy numb, I had the max 400 yard shot on a small 6 point, but he wouldn't budge, and there was one large branch on a dead tree that was in the way. In the end, right before it was too dark, a spike wandered down below me at 350 and the freezer was filled. Last thing is, I had nestled in against a dead log in the shade at that 400, and they had a good 15 minutes to spot me, but didn't. What a day!