I haven't hunted Unit 31, but when you're in flat country, look for steep canyons or bluffs. They will graze out in the open like antelope when they aren't pushed, but will head for steep country when there is hunting pressure, and during the middle of the day. They can go weeks without water, but I have seen them at salt licks. They have a slight red tint to them that stands out a bit against the yellow grass. When the sun is low, the red really stands out. I have Steiner Predator binos that emphasize the browns and reds. Works well. Good luck.