i was hiking on the AT a couple years ago and got to this part that ran along a dark rocky area for about 4 miles. all i heard was rattles going off in the bushes as i walked through then i almost walked on one it coiled up and started rattling i was about 3-4 feet from it. i hummed sum rocks at it and missed. then picked up about a 50 pound rock walked up to it crushed it. it did this funny roll and rolled off the trail and stopped rattling. they scare the shit out of me.