Pronghorn are the fastest runners in Yellowstone. When they need to, they can run at 70 miles per hour (113 kph) for three to four minutes. That's as fast as most cars go on the highway.
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.