I think this picture about sums it up:

We looked at various iterations of this sign for 740 miles today. We moved into Mountain Time, and crossed the Continental Divide and spent 12 hours in the car. Oh, and we saw pronghorn antelope. Which, according to our two nerdy scientist travel companions, are actually specific to this region and this region only. Exciting to see, one might say. Who’da thunk it? I thought they were elk.