This is the second rattlesnake of the day, also within 1 foot of the trail we were hiking on. He was curled up under the rocks. The first picture is his head sticking out slightly. We got to see it slither up into the rock pile a few moments later, it was ~2-3 inches thick. It was probably around 80 degrees. Very exciting day! Don't think I will be taking a break on any trailside rocks in the near future.