As we stepped out of our car at the welcome center, two bighorn sheep ran past us. One scrambled up the hill and looked out over the valley. Can't guarantee that you will see one too, but they didn't appear to be afraid of people. The temperature was over 110 degrees so we basically drove through the park, stopping every now and then to get out of the car and take some photos before continuing on to the next stop. If it had been cooler we would have definately hiked a trail or two. Incredible views in person that no photograph can do justice.