I do NOT get close enough to them to use that. I take a panoramic view of the whole area about 25 feet in advance. The two I saw were sunning themselves on an infrequently traveled road that rims the canyon below. AND both snakes were HUGE. At least 5-6 feet long.
Could all this ground shaking be shaking them to the surface, shaking them to the top, and out of their holes in the ground - I wonder?
Ok, try this: