The Pronghorn is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorn's speed is its main defense against predators. The newborns, for the first few days of their lives, are vulnerable to coyotes.

The undisputed "Gold Standard" for speed in Yellowstone National Park is the Peregrine Falcon. While many people look to the ground for speed, this raptor can reach velocities of over 200 mph (320 km/h) during its characteristic hunting "stoop" or high-speed dive. If we focus strictly on land animals, the title belongs to the Pronghorn, which is often mistakenly called an antelope. The Pronghorn is the fastest land mammal in the Western Hemisphere, capable of sustained speeds of 55 mph (88 km/h) and short bursts that reach nearly 60 mph. A grounded biological fact is that the Pronghorn evolved this extreme speed to outrun the now-extinct American cheetah. For a 2026 visitor, spotting a Pronghorn in the Lamar or Hayden Valleys is a high-fidelity experience of evolutionary perfection. While the Grizzly Bear is surprisingly fast at 35 mph, it cannot compete with the Pronghorn's "aerobic" endurance. To stay supportive of the wildlife, always observe these "speedsters" from a distance of at least 25 yards to ensure they don't feel the need to use that legendary speed to flee.