S is for Snake
The prairie rattlesnake is the only poisonous snake in Yellowstone. They are not very common so most people feel lucky if they see one.
Did You Know?
The 1988 fires affected 793,880 acres or 36 percent of the park. Five fires burned into the park that year from adjacent public lands. The largest, the North Fork Fire, started from a discarded cigarette. It burned more than 410,000 acres.