A timber rattlesnake crosses a grassy patch.
Rattlesnakes
The timber rattlesnake, a rare or endangered species along much of the Appalachian Trail, does indeed have venom in its fangs, but far from looking to harm you, this snake actually needs your cooperation to survive.
Typical "rattlesnake country" is the high rocky ridges along the Appalachian Trail. A rattlesnake bite can do serious damage, but it does not necessarily kill.