A nice 3 foot Rattler in the Wasatch. He was a pleasant snake,didn't even strike at me,just kindly rattled at me from the side of the trail to let me know he was there and didn't want to get stepped on. Can't blame him for that,and I really didn't want to step on him either,especially since I was wearing sandals.
The Sumatran form of this species is sometimes called the Spotted Cat Snake. Photo from near the town Telukkuantan. (That is a machete cut on its head).