These Mohave rattlers have two types of toxins. One like a regular rattler, and another that attacks the nervous system. We get a lot of those guys too. The Az black rattlers are mostly up on higher ground in the nearby mountains.
It'd be trivial to do (with any of the half dozen methods I can quickly think of), but I just abhor selective color photos; rarely do they (IMO) end up looking good. May go back and give it some work to look like an old an faded photo, but after a couple hours of removing the parking spot markers, pile of gravel and wire fence I was ready to move on!
Went to a photo conference in Little Rock a few weeks back and took advantage of the 110F+ temps on my way back and visited Petit Jean state park. Don't know why but the crowds were nearly non-existent!
Forget which overlook this was, but Mt. Magazine can be seen in the distance.