Eastern hognose snake

When threatened, the neck is flattened and the head is raised off the ground, not unlike a cobra. They also hiss and will strike but they do not attempt to bite, the result can be likened to a high speed head-butt. If this threat display does not work to deter a would-be predator, hognose snakes will often roll onto their back and play dead, going so far as to emit a foul musk from their cloaca and let their tongue hang out of their mouth. - Wikipedia