At different times I've come across three rattle snakes while detecting in Nevada. In those days I didn't have any headphones, so I heard two of them first, before I saw them. They take on the color of the background, one snake was quite black in among some very dark basalt rock, the other was very tan, on a tan covered sagebrush flat. They moved away from the coil, sounding off as they moved. I'm now deaf enough I probably wouldn't hear the snake anyhow, and I use good quality phones so I can hear the target. My experience was two times was the coil moved the snake and it ran from me. The third one was a cool morning, and it was coiled up tight in a depression it had wormed around and hollowed out, the same color as the tan soil. Because I was watching the ground where I was swinging, I saw the snake. I had a video camera with me at the time, and I wanted to get a recording of it rattling, and the darn thing didn't want to leave it's hole, or even rattle. So I had the camera going, and the bloody thing wouldn't rattle even when stirred up with a piece of wire I had. Finally poked it enough that it ran to a sage bush, and wound around in it, still not rattling. So I poked it some more, and finally got it to rattle, but the video didn't turn out like I wanted it to. I'm not above killing a snake, but all three of those got away, and I left the area. My experience is if you run into a rattle snake, there are more. I set out to kill the one in the bush, so I put the camera in the back in the truck and got a gun, but the snake was gone when I got back. Then I started seeing those depressions everywhere I looked, no snakes in them, but lots of depressions, got worried about stepping on a coiled up snake and beat feet out of that place also. These snakes were all in different locations at different times, miles apart. A fourth snake was a big fella. There was a pioneer grave of a little girl buried on the desert just across the fence of a ranch I worked for. Her parents loved her enough that they built a rock wall and had a nice headstone. No remains of a house or anything else in the area, just this lonely grave on the desert. I quit that job, and it was years later that I went back by that location. Someone had dug up the grave, and stolen the head stone. In amongst the stone wreckage was a huge rattlesnake, and I left that one live on purpose. My hope is the child died of some disease that was still in the grave, and who ever dug it up got sick, and maybe the next person that wanted to desacrate it would get snake bit.