Fastest land mammal in North America!
A small population of pronghorn live in Yellowstone's Northern Range, preferring the open grassland of the Lamar Valley. Pronghorn evolved to outrun a now-extinct cheetah, so healthy adults are very hard for today's predators to catch. Wolves know there are many easier meals to be had.
Newborn fawns hidden in the grass, however, provide meals to many predators in late spring and early summer. Once fawns can keep up with their mothers, predators once again look for more attainable prey.
Pronghorn live in small family groups for protection. If they spot a threat with their large eyes, they flare the white fur on their rumps to signal danger to others. Like other ungulates, they also have sharp hooves which can deal damage to unwitting wolves.